diff --git a/docs/errors/E0719.md b/docs/errors/E0719.md
new file mode 100644
index 0000000000..cdc28a2447
--- /dev/null
+++ b/docs/errors/E0719.md
@@ -0,0 +1,15 @@
+# E0719: unexpected 'await' keyword on function declaration
+
+If you meant to define an asynchronous function, you need to explicitly annotate
+the function with `async` keyword, not `await`.
+
+```javascript
+await function f() {}
+```
+
+To fix this warning, simply replace `await` by `async`. Now, you have an
+asynchronous function and you're able to use `await` inside it.
+
+```javascript
+async function f() {}
+```
diff --git a/po/messages.pot b/po/messages.pot
index cfca0327e2..bc9e0cb6e6 100644
--- a/po/messages.pot
+++ b/po/messages.pot
@@ -2417,6 +2417,10 @@ msgstr ""
 msgid "using a '.' after a '?.' might fail, since '?.' might return 'undefined'."
 msgstr ""
 
+#: src/quick-lint-js/diag/diagnostic-metadata-generated.cpp
+msgid "unexpected 'await' keyword on function declaration; maybe you meant 'async'?"
+msgstr ""
+
 #: test/test-diagnostic-formatter.cpp
 #: test/test-vim-qflist-json-diag-reporter.cpp
 msgid "something happened"
diff --git a/src/quick-lint-js/diag/diagnostic-metadata-generated.cpp b/src/quick-lint-js/diag/diagnostic-metadata-generated.cpp
index f29b70bfbd..da91494369 100644
--- a/src/quick-lint-js/diag/diagnostic-metadata-generated.cpp
+++ b/src/quick-lint-js/diag/diagnostic-metadata-generated.cpp
@@ -6927,6 +6927,20 @@ const QLJS_CONSTINIT Diagnostic_Info all_diagnostic_infos[] = {
         },
       },
     },
+
+    // Diag_Unexpected_Await_On_Function_Declaration
+    {
+      .code = 719,
+      .severity = Diagnostic_Severity::warning,
+      .message_formats = {
+        QLJS_TRANSLATABLE("unexpected 'await' keyword on function declaration; maybe you meant 'async'?"),
+      },
+      .message_args = {
+        {
+          Diagnostic_Message_Arg_Info(offsetof(Diag_Unexpected_Await_On_Function_Declaration, await_keyword), Diagnostic_Arg_Type::source_code_span),
+        },
+      },
+    },
 };
 }
 
diff --git a/src/quick-lint-js/diag/diagnostic-metadata-generated.h b/src/quick-lint-js/diag/diagnostic-metadata-generated.h
index bbd9239b0e..2887aed883 100644
--- a/src/quick-lint-js/diag/diagnostic-metadata-generated.h
+++ b/src/quick-lint-js/diag/diagnostic-metadata-generated.h
@@ -473,10 +473,11 @@ namespace quick_lint_js {
   QLJS_DIAG_TYPE_NAME(Diag_Unintuitive_Bitshift_Precedence) \
   QLJS_DIAG_TYPE_NAME(Diag_TypeScript_Namespace_Alias_Cannot_Use_Import_Type) \
   QLJS_DIAG_TYPE_NAME(Diag_Using_Dot_After_Optional_Chaining) \
+  QLJS_DIAG_TYPE_NAME(Diag_Unexpected_Await_On_Function_Declaration) \
   /* END */
 // clang-format on
 
-inline constexpr int Diag_Type_Count = 462;
+inline constexpr int Diag_Type_Count = 463;
 
 extern const Diagnostic_Info all_diagnostic_infos[Diag_Type_Count];
 }
diff --git a/src/quick-lint-js/diag/diagnostic-types-2.h b/src/quick-lint-js/diag/diagnostic-types-2.h
index b858eae431..92a6cb41f4 100644
--- a/src/quick-lint-js/diag/diagnostic-types-2.h
+++ b/src/quick-lint-js/diag/diagnostic-types-2.h
@@ -3599,6 +3599,15 @@ struct Diag_Using_Dot_After_Optional_Chaining {
   Source_Code_Span dot_op;
   Source_Code_Span optional_chain_op;
 };
+
+struct Diag_Unexpected_Await_On_Function_Declaration {
+  [[qljs::diag("E0719", Diagnostic_Severity::warning)]]  //
+  // clang-format off
+  [[qljs::message("unexpected 'await' keyword on function declaration; maybe you meant 'async'?",
+                  ARG(await_keyword))]]  //
+  // clang-format on
+  Source_Code_Span await_keyword;
+};
 }
 QLJS_WARNING_POP
 
diff --git a/src/quick-lint-js/fe/parse-statement.cpp b/src/quick-lint-js/fe/parse-statement.cpp
index df3c959349..592bb6d1d7 100644
--- a/src/quick-lint-js/fe/parse-statement.cpp
+++ b/src/quick-lint-js/fe/parse-statement.cpp
@@ -417,6 +417,20 @@ bool Parser::parse_and_visit_statement(Parse_Visitor_Base &v,
       this->skip();
       this->check_body_after_label();
       goto parse_statement;
+    } else if (this->peek().type == Token_Type::kw_function) {
+      this->parse_and_visit_function_declaration(
+          v, Function_Declaration_Options{
+                 .attributes = Function_Attributes::normal,
+                 .begin = this->peek().begin,
+                 .require_name = Name_Requirement::required_for_statement,
+                 .async_keyword = std::nullopt,
+                 .declare_keyword = std::nullopt,
+             });
+      if (this->peek().type != Token_Type::left_paren) {
+        this->diag_reporter_->report(
+            Diag_Unexpected_Await_On_Function_Declaration{
+                .await_keyword = await_token.span()});
+      }
     } else {
       Expression *ast =
           this->parse_await_expression(v, await_token, Precedence{});
diff --git a/src/quick-lint-js/i18n/translation-table-generated.cpp b/src/quick-lint-js/i18n/translation-table-generated.cpp
index 5c8c06916d..d43a5dcc30 100644
--- a/src/quick-lint-js/i18n/translation-table-generated.cpp
+++ b/src/quick-lint-js/i18n/translation-table-generated.cpp
@@ -557,7 +557,8 @@ const Translation_Table translation_data = {
         {0, 0, 0, 0, 0, 15},                 //
         {0, 0, 0, 15, 0, 62},                //
         {16, 12, 14, 32, 17, 34},            //
-        {31, 12, 34, 35, 33, 29},            //
+        {0, 0, 0, 0, 0, 29},                 //
+        {31, 12, 34, 35, 33, 77},            //
         {53, 46, 52, 49, 41, 43},            //
         {45, 43, 53, 32, 39, 33},            //
         {56, 49, 55, 52, 44, 46},            //
@@ -2429,6 +2430,7 @@ const Translation_Table translation_data = {
         u8"unexpected '?' in type; use '| void' to make an optional type\0"
         u8"unexpected '?' when destructuring\0"
         u8"unexpected '\\' in identifier\0"
+        u8"unexpected 'await' keyword on function declaration; maybe you meant 'async'?\0"
         u8"unexpected 'case' outside switch statement\0"
         u8"unexpected 'catch' without 'try'\0"
         u8"unexpected 'default' outside switch statement\0"
diff --git a/src/quick-lint-js/i18n/translation-table-generated.h b/src/quick-lint-js/i18n/translation-table-generated.h
index 02355e8fb5..1b006e019f 100644
--- a/src/quick-lint-js/i18n/translation-table-generated.h
+++ b/src/quick-lint-js/i18n/translation-table-generated.h
@@ -18,8 +18,8 @@ namespace quick_lint_js {
 using namespace std::literals::string_view_literals;
 
 constexpr std::uint32_t translation_table_locale_count = 5;
-constexpr std::uint16_t translation_table_mapping_table_size = 606;
-constexpr std::size_t translation_table_string_table_size = 82482;
+constexpr std::uint16_t translation_table_mapping_table_size = 607;
+constexpr std::size_t translation_table_string_table_size = 82559;
 constexpr std::size_t translation_table_locale_table_size = 35;
 
 QLJS_CONSTEVAL std::uint16_t translation_table_const_look_up(
@@ -572,6 +572,7 @@ QLJS_CONSTEVAL std::uint16_t translation_table_const_look_up(
           "unexpected '?' in type; use '| void' to make an optional type"sv,
           "unexpected '?' when destructuring"sv,
           "unexpected '\\' in identifier"sv,
+          "unexpected 'await' keyword on function declaration; maybe you meant 'async'?"sv,
           "unexpected 'case' outside switch statement"sv,
           "unexpected 'catch' without 'try'"sv,
           "unexpected 'default' outside switch statement"sv,
diff --git a/src/quick-lint-js/i18n/translation-table-test-generated.h b/src/quick-lint-js/i18n/translation-table-test-generated.h
index db9a0443c5..b4591cccaa 100644
--- a/src/quick-lint-js/i18n/translation-table-test-generated.h
+++ b/src/quick-lint-js/i18n/translation-table-test-generated.h
@@ -27,7 +27,7 @@ struct Translated_String {
 };
 
 // clang-format off
-inline const Translated_String test_translation_table[605] = {
+inline const Translated_String test_translation_table[606] = {
     {
         "\"global-groups\" entries must be strings"_translatable,
         u8"\"global-groups\" entries must be strings",
@@ -6034,6 +6034,17 @@ inline const Translated_String test_translation_table[605] = {
             u8"of\u00f6rv\u00e4ntad '\\' i identifierare",
         },
     },
+    {
+        "unexpected 'await' keyword on function declaration; maybe you meant 'async'?"_translatable,
+        u8"unexpected 'await' keyword on function declaration; maybe you meant 'async'?",
+        {
+            u8"unexpected 'await' keyword on function declaration; maybe you meant 'async'?",
+            u8"unexpected 'await' keyword on function declaration; maybe you meant 'async'?",
+            u8"unexpected 'await' keyword on function declaration; maybe you meant 'async'?",
+            u8"unexpected 'await' keyword on function declaration; maybe you meant 'async'?",
+            u8"unexpected 'await' keyword on function declaration; maybe you meant 'async'?",
+        },
+    },
     {
         "unexpected 'case' outside switch statement"_translatable,
         u8"unexpected 'case' outside switch statement",
diff --git a/test/test-parse-function.cpp b/test/test-parse-function.cpp
index 79e9ca668c..ccd12c7050 100644
--- a/test/test-parse-function.cpp
+++ b/test/test-parse-function.cpp
@@ -1799,6 +1799,21 @@ TEST_F(Test_Parse_Function, return_with_comma_operator_missing_arguments) {
       u8"                      ^ Diag_Missing_Operand_For_Operator"_diag);
 }
 }
+
+TEST_F(Test_Parse_Function, unexpected_await_on_function_declaration) {
+  test_parse_and_visit_statement(
+      u8"await function f() { }"_sv,  //
+      u8"^^^^^ Diag_Unexpected_Await_On_Function_Declaration"_diag);
+
+  test_parse_and_visit_statement(u8"async function f() { }"_sv,  //
+                                 no_diags);
+
+  test_parse_and_visit_statement(u8"await function foo() {}();"_sv,  //
+                                 no_diags);
+
+  test_parse_and_visit_statement(u8"await (function foo() {});"_sv,  //
+                                 no_diags);
+}
 }
 
 // quick-lint-js finds bugs in JavaScript programs.