1 files changed, 1 insertions, 1 deletions

diff --git a/src/widget.h b/src/widget.h
index 2c5fb61df2f..97dd6ab61de 100644
--- a/src/widget.h
+++ b/src/widget.h
@@ -90,7 +90,7 @@ along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
 typedef struct _EmacsFrameRec *EmacsFrame;
 typedef struct _EmacsFrameClassRec *EmacsFrameClass;
 
-extern WidgetClass emacsFrameClass;
+extern WidgetClass emacsFrameClass (void);
 
 extern struct _DisplayContext *display_context;