diff --git a/pbx.c b/pbx.c
index cb7c6446bbf1d6cfed04b9147158635130aff3ff..e78fc2afb7cd2513d91bad3b607c3ef74d421c93 100755
--- a/pbx.c
+++ b/pbx.c
@@ -3682,7 +3682,7 @@ int ast_add_extension2(struct ast_context *con,
 	}
 	e = con->root;
 	while(e) {
-		res= strcasecmp(e->exten, extension);
+		res= strcmp(e->exten, extension);
 		if (!res) {
 			if (!e->matchcid && !tmp->matchcid)
 				res = 0;