diff --git a/src/test-core/test-stuff.h b/src/test-core/test-stuff.h
index 0054d2c76a..a3a857d8fd 100644
--- a/src/test-core/test-stuff.h
+++ b/src/test-core/test-stuff.h
@@ -120,7 +120,7 @@ void test_set_called( const gboolean val );
  * Destructively tests (meaning that it resets called to FALSE) and
  * returns the value of called.
  */
-const test_reset_called( void );
+const gboolean test_reset_called( void );
 
 /**
  * Set the test data pointer with the what you expect your mock to be