diff --git a/bindgen-tests/tests/expectations/tests/inline_namespace_macro.rs b/bindgen-tests/tests/expectations/tests/inline_namespace_macro.rs
new file mode 100644
index 0000000000..99ca607d2f
--- /dev/null
+++ b/bindgen-tests/tests/expectations/tests/inline_namespace_macro.rs
@@ -0,0 +1,20 @@
+#![allow(dead_code, non_snake_case, non_camel_case_types, non_upper_case_globals)]
+#[allow(non_snake_case, non_camel_case_types, non_upper_case_globals)]
+pub mod root {
+    #[allow(unused_imports)]
+    use self::super::root;
+    pub mod repro {
+        #[allow(unused_imports)]
+        use self::super::super::root;
+        #[repr(C)]
+        #[derive(Debug, Default, Copy, Clone)]
+        pub struct duration {
+            pub _address: u8,
+        }
+        #[allow(clippy::unnecessary_operation, clippy::identity_op)]
+        const _: () = {
+            ["Size of duration"][::std::mem::size_of::<duration>() - 1usize];
+            ["Alignment of duration"][::std::mem::align_of::<duration>() - 1usize];
+        };
+    }
+}
diff --git a/bindgen-tests/tests/headers/inline_namespace_macro.hpp b/bindgen-tests/tests/headers/inline_namespace_macro.hpp
new file mode 100644
index 0000000000..c7cf5caf98
--- /dev/null
+++ b/bindgen-tests/tests/headers/inline_namespace_macro.hpp
@@ -0,0 +1,9 @@
+// bindgen-flags: --enable-cxx-namespaces -- -std=c++11
+
+#include "namespace/nsdefine.h"
+
+BEGIN_NAMESPACE
+
+class duration {};
+
+END_NAMESPACE
diff --git a/bindgen-tests/tests/headers/namespace/nsdefine.h b/bindgen-tests/tests/headers/namespace/nsdefine.h
new file mode 100644
index 0000000000..6504fa9f0a
--- /dev/null
+++ b/bindgen-tests/tests/headers/namespace/nsdefine.h
@@ -0,0 +1,4 @@
+#pragma once
+
+#define BEGIN_NAMESPACE namespace repro { inline namespace __1 {
+#define END_NAMESPACE } }
diff --git a/bindgen/clang.rs b/bindgen/clang.rs
index e585fb31bd..47f07a384e 100644
--- a/bindgen/clang.rs
+++ b/bindgen/clang.rs
@@ -970,6 +970,11 @@ impl Cursor {
             })
         }
     }
+
+    /// Is this cursor's referent a namespace that is inline?
+    pub(crate) fn is_inline_namespace(&self) -> bool {
+        unsafe { clang_Cursor_isInlineNamespace(self.x) != 0 }
+    }
 }
 
 /// A struct that owns the tokenizer result from a given cursor.
diff --git a/bindgen/ir/context.rs b/bindgen/ir/context.rs
index 75f6a1ec8f..d32bb144a1 100644
--- a/bindgen/ir/context.rs
+++ b/bindgen/ir/context.rs
@@ -2328,6 +2328,10 @@ If you encounter an error missing from this list, please file an issue or a PR!"
             }
         }
 
+        if cursor.is_inline_namespace() {
+            kind = ModuleKind::Inline;
+        }
+
         (module_name, kind)
     }