diff --git a/lang/cem/cemcom.ansi/idf.c b/lang/cem/cemcom.ansi/idf.c
index 0681ddadd..58316a3ab 100644
--- a/lang/cem/cemcom.ansi/idf.c
+++ b/lang/cem/cemcom.ansi/idf.c
@@ -415,9 +415,10 @@ global_redecl(idf, new_sc, tp)
 	*/
 	register struct def *def = idf->id_def;
 
-	if (!equal_type(tp, def->df_type, 0))
+	if (!equal_type(tp, def->df_type, 0)) {
 		error("redeclaration of %s with different type", idf->id_text);
-	else	update_proto(tp, def->df_type);
+		return;
+	} else	update_proto(tp, def->df_type);
 	if (tp->tp_fund == ARRAY) {
 		/* Multiple array declaration; this may be interesting */
 		if (tp->tp_size < 0)	{		/* new decl has [] */