diff --git a/stubs/typeCheckingFunctions.stub b/stubs/typeCheckingFunctions.stub
index 82d9c83cde..4f06338125 100644
--- a/stubs/typeCheckingFunctions.stub
+++ b/stubs/typeCheckingFunctions.stub
@@ -105,7 +105,7 @@ function is_long(mixed $value): bool
 }
 
 /**
- * @phpstan-assert-if-true resource $value
+ * @phpstan-assert-if-true =resource $value
  * @return bool
  */
 function is_resource(mixed $value): bool
diff --git a/tests/PHPStan/Analyser/NodeScopeResolverTest.php b/tests/PHPStan/Analyser/NodeScopeResolverTest.php
index 3a1bf98033..6a8c6b517d 100644
--- a/tests/PHPStan/Analyser/NodeScopeResolverTest.php
+++ b/tests/PHPStan/Analyser/NodeScopeResolverTest.php
@@ -143,6 +143,8 @@ public function dataFileAsserts(): iterable
 			yield from $this->gatherAssertTypes(__DIR__ . '/../Rules/Functions/data/bug-7823.php');
 		}
 
+		yield from $this->gatherAssertTypes(__DIR__ . '/../Analyser/data/is-resource-specified.php');
+
 		yield from $this->gatherAssertTypes(__DIR__ . '/../Rules/Arrays/data/bug-7954.php');
 		yield from $this->gatherAssertTypes(__DIR__ . '/../Rules/Comparison/data/docblock-assert-equality.php');
 		yield from $this->gatherAssertTypes(__DIR__ . '/../Rules/Properties/data/bug-7839.php');
diff --git a/tests/PHPStan/Analyser/data/is-resource-specified.php b/tests/PHPStan/Analyser/data/is-resource-specified.php
new file mode 100644
index 0000000000..c78d5ad75a
--- /dev/null
+++ b/tests/PHPStan/Analyser/data/is-resource-specified.php
@@ -0,0 +1,11 @@
+<?php
+
+use function PHPStan\Testing\assertType;
+
+$resource = fopen('php://memory', 'r');
+
+if (is_resource($resource)) {
+	assertType('resource', $resource);
+} else {
+	assertType('resource|false', $resource); // can be closed resource
+}
diff --git a/tests/PHPStan/Rules/Comparison/data/check-type-function-call.php b/tests/PHPStan/Rules/Comparison/data/check-type-function-call.php
index d9fb0b0845..814d93ae60 100644
--- a/tests/PHPStan/Rules/Comparison/data/check-type-function-call.php
+++ b/tests/PHPStan/Rules/Comparison/data/check-type-function-call.php
@@ -967,3 +967,12 @@ function checkSuperGlobals(): void
 		if (is_int($k)) {}
 	}
 }
+
+/**
+ * @param resource $resource
+ */
+function checkClosedResource($resource): void {
+	if (!is_resource($resource)) {
+
+	}
+}