diff --git a/dmyext.c b/dmyext.c
index 741dc59166..34ea7a02f4 100644
--- a/dmyext.c
+++ b/dmyext.c
@@ -4,6 +4,6 @@ Init_ext(void)
 }
 
 void
-Init_enc()
+Init_enc(void)
 {
 }