diff --git a/Modules/tkappinit.c b/Modules/tkappinit.c
index c57f0e7c281..52874469dff 100644
--- a/Modules/tkappinit.c
+++ b/Modules/tkappinit.c
@@ -16,8 +16,7 @@
 #include <tk.h>
 
 int
-Tcl_AppInit(interp)
-	Tcl_Interp *interp;
+Tcl_AppInit(Tcl_Interp *interp)
 {
 	Tk_Window main;