diff --git a/src/proto/if_python.pro b/src/proto/if_python.pro
index 793b6ee..ec12402 100644
--- a/src/proto/if_python.pro
+++ b/src/proto/if_python.pro
@@ -1,6 +1,7 @@
 /* if_python.c */
 int python_enabled __ARGS((int verbose));
 void python_end __ARGS((void));
+int python_loaded __ARGS((void));
 void ex_python __ARGS((exarg_T *eap));
 void ex_pyfile __ARGS((exarg_T *eap));
 void python_buffer_free __ARGS((buf_T *buf));
diff --git a/src/proto/if_python3.pro b/src/proto/if_python3.pro
index f9921e1..9c132c3 100644
--- a/src/proto/if_python3.pro
+++ b/src/proto/if_python3.pro
@@ -1,6 +1,7 @@
 /* if_python3.c */
 int python3_enabled __ARGS((int verbose));
 void python3_end __ARGS((void));
+int python3_loaded __ARGS((void));
 void ex_py3 __ARGS((exarg_T *eap));
 void ex_py3file __ARGS((exarg_T *eap));
 void python3_buffer_free __ARGS((buf_T *buf));