diff --git a/src/ecmascript/mujs/xhr.c b/src/ecmascript/mujs/xhr.c
index 3907230a..21cacbae 100644
--- a/src/ecmascript/mujs/xhr.c
+++ b/src/ecmascript/mujs/xhr.c
@@ -416,7 +416,7 @@ mjs_xhr_open(js_State *J)
 		return;
 	}
 
-	if (!strchr(xhr->responseURL, '/')) {
+	if (xhr->responseURL[0] != '/') {
 		char *ref = get_uri_string(vs->uri, URI_DIR_LOCATION | URI_PATH);
 
 		if (ref) {
diff --git a/src/ecmascript/quickjs/xhr.c b/src/ecmascript/quickjs/xhr.c
index 37222233..967699f6 100644
--- a/src/ecmascript/quickjs/xhr.c
+++ b/src/ecmascript/quickjs/xhr.c
@@ -1058,7 +1058,7 @@ xhr_open(JSContext *ctx, JSValueConst this_val, int argc, JSValueConst *argv)
 		struct ecmascript_interpreter *interpreter = (struct ecmascript_interpreter *)JS_GetContextOpaque(ctx);
 		struct view_state *vs = interpreter->vs;
 
-		if (!strchr(x->responseURL, '/')) {
+		if (x->responseURL[0] != '/') {
 			char *ref = get_uri_string(vs->uri, URI_DIR_LOCATION | URI_PATH);
 
 			if (ref) {
diff --git a/src/ecmascript/spidermonkey/xhr.cpp b/src/ecmascript/spidermonkey/xhr.cpp
index 28e0359f..0505e4fc 100644
--- a/src/ecmascript/spidermonkey/xhr.cpp
+++ b/src/ecmascript/spidermonkey/xhr.cpp
@@ -608,7 +608,7 @@ xhr_open(JSContext *ctx, unsigned int argc, JS::Value *rval)
 		return false;
 	}
 
-	if (!strchr(xhr->responseURL, '/')) {
+	if (xhr->responseURL[0] != '/') {
 		char *ref = get_uri_string(vs->uri, URI_DIR_LOCATION | URI_PATH);
 
 		if (ref) {