diff --git a/Modules/timemodule.c b/Modules/timemodule.c
index 189476c498b..18223b2883d 100644
--- a/Modules/timemodule.c
+++ b/Modules/timemodule.c
@@ -91,7 +91,7 @@ extern int ftime(struct timeb *);
 
 /* Forward declarations */
 static int floatsleep(double);
-static double floattime(double);
+static double floattime(void);
 
 /* For Y2K check */
 static PyObject *moddict;