diff --git a/include/yap_structs.h b/include/yap_structs.h
index dac465c95..23b5a466d 100755
--- a/include/yap_structs.h
+++ b/include/yap_structs.h
@@ -217,7 +217,9 @@ typedef struct yap_boot_params {
   char *ErrorCause;
 } YAP_init_args;
 
+#ifdef YAP_H
 Int Yap_InitDefaults( YAP_init_args *init_args, char saved_state[] );
+#endif
 
 /* from thread.h */
 typedef struct {