diff --git a/hw/xfree86/os-support/shared/VTsw_noop.c b/hw/xfree86/os-support/shared/VTsw_noop.c
index a3cfe40b9..78cbe0e34 100644
--- a/hw/xfree86/os-support/shared/VTsw_noop.c
+++ b/hw/xfree86/os-support/shared/VTsw_noop.c
@@ -36,19 +36,19 @@
  */
 
 Bool
-xf86VTSwitchPending()
+xf86VTSwitchPending(void)
 {
 	return(FALSE);
 }
 
 Bool
-xf86VTSwitchAway()
+xf86VTSwitchAway(void)
 {
 	return(FALSE);
 }
 
 Bool
-xf86VTSwitchTo()
+xf86VTSwitchTo(void)
 {
 	return(TRUE);
 }