diff --git a/src/proto/if_ruby.pro b/src/proto/if_ruby.pro
index 352f155..7dedb22 100644
--- a/src/proto/if_ruby.pro
+++ b/src/proto/if_ruby.pro
@@ -1,9 +1,9 @@
 /* if_ruby.c */
-extern int ruby_enabled __ARGS((int verbose));
-extern void ruby_end __ARGS((void));
-extern void ex_ruby __ARGS((exarg_T *eap));
-extern void ex_rubydo __ARGS((exarg_T *eap));
-extern void ex_rubyfile __ARGS((exarg_T *eap));
-extern void ruby_buffer_free __ARGS((buf_T *buf));
-extern void ruby_window_free __ARGS((win_T *win));
+int ruby_enabled __ARGS((int verbose));
+void ruby_end __ARGS((void));
+void ex_ruby __ARGS((exarg_T *eap));
+void ex_rubydo __ARGS((exarg_T *eap));
+void ex_rubyfile __ARGS((exarg_T *eap));
+void ruby_buffer_free __ARGS((buf_T *buf));
+void ruby_window_free __ARGS((win_T *win));
 /* vim: set ft=c : */