diff --git a/src/message.c b/src/message.c
index 621edb9..a7aca2b 100644
--- a/src/message.c
+++ b/src/message.c
@@ -730,6 +730,7 @@
     return TRUE;		/* no error messages at the moment */
 }
 
+#ifndef PROTO  // manual proto with __attribute__
 /*
  * Print an error message with format string and variable arguments.
  * Note: caller must not pass 'IObuff' as 1st argument.
@@ -749,6 +750,7 @@
     }
     return TRUE;		/* no error messages at the moment */
 }
+#endif
 
 /*
  * Same as emsg(...), but abort on error when ABORT_ON_INTERNAL_ERROR is
@@ -765,6 +767,7 @@
 #endif
 }
 
+#ifndef PROTO  // manual proto with __attribute__
 /*
  * Same as semsg(...) but abort on error when ABORT_ON_INTERNAL_ERROR is
  * defined. It is used for internal errors only, so that they can be
@@ -783,10 +786,11 @@
 	va_end(ap);
 	emsg_core(IObuff);
     }
-#ifdef ABORT_ON_INTERNAL_ERROR
+# ifdef ABORT_ON_INTERNAL_ERROR
     abort();
-#endif
+# endif
 }
+#endif
 
 /*
  * Give an "Internal error" message.