diff --git a/src/ecmascript/ecmascript.c b/src/ecmascript/ecmascript.c
index 2a5a2e99..f2babf70 100644
--- a/src/ecmascript/ecmascript.c
+++ b/src/ecmascript/ecmascript.c
@@ -594,7 +594,7 @@ ecmascript_set_timeout(struct ecmascript_interpreter *interpreter, char *code, i
 	init_string(&interpreter->code);
 	add_to_string(&interpreter->code, code);
 	mem_free(code);
-	if (check_in_map_timer(interpreter->vs->doc_view->document->timeout)) {
+	if (found_in_map_timer(interpreter->vs->doc_view->document->timeout)) {
 		kill_timer(&interpreter->vs->doc_view->document->timeout);
 	}
 	install_timer(&interpreter->vs->doc_view->document->timeout, timeout, ecmascript_timeout_handler, interpreter);
@@ -609,7 +609,7 @@ ecmascript_set_timeout2(struct ecmascript_interpreter *interpreter, JS::HandleVa
 	assert(interpreter && interpreter->vs->doc_view->document);
 	done_string(&interpreter->code);
 	init_string(&interpreter->code);
-	if (check_in_map_timer(interpreter->vs->doc_view->document->timeout)) {
+	if (found_in_map_timer(interpreter->vs->doc_view->document->timeout)) {
 		kill_timer(&interpreter->vs->doc_view->document->timeout);
 	}
 	JS::RootedValue fun((JSContext *)interpreter->backend_data, f);
@@ -627,7 +627,7 @@ ecmascript_set_timeout2q(struct ecmascript_interpreter *interpreter, JSValueCons
 	assert(interpreter && interpreter->vs->doc_view->document);
 	done_string(&interpreter->code);
 	init_string(&interpreter->code);
-	if (check_in_map_timer(interpreter->vs->doc_view->document->timeout)) {
+	if (found_in_map_timer(interpreter->vs->doc_view->document->timeout)) {
 		kill_timer(&interpreter->vs->doc_view->document->timeout);
 	}
 	interpreter->fun = fun;
diff --git a/src/ecmascript/quickjs/window.c b/src/ecmascript/quickjs/window.c
index 117b0c9b..6095a5c8 100644
--- a/src/ecmascript/quickjs/window.c
+++ b/src/ecmascript/quickjs/window.c
@@ -240,7 +240,7 @@ js_window_clearTimeout(JSContext *ctx, JSValueConst this_val, int argc, JSValueC
 
 	timer_id_T id = reinterpret_cast<timer_id_T>(number);
 
-	if (check_in_map_timer(id)) {
+	if (found_in_map_timer(id)) {
 		kill_timer(&id);
 	}
 
diff --git a/src/ecmascript/spidermonkey/window.c b/src/ecmascript/spidermonkey/window.c
index ee7f63b7..5290c200 100644
--- a/src/ecmascript/spidermonkey/window.c
+++ b/src/ecmascript/spidermonkey/window.c
@@ -483,7 +483,7 @@ window_clearTimeout(JSContext *ctx, unsigned int argc, JS::Value *rval)
 	int64_t number = JS::ToBigInt64(bi);
 	timer_id_T id = reinterpret_cast<timer_id_T>(number);
 
-	if (check_in_map_timer(id)) {
+	if (found_in_map_timer(id)) {
 		kill_timer(&id);
 	}
 	return true;
diff --git a/src/ecmascript/timer.h b/src/ecmascript/timer.h
index 69495cd9..df133015 100644
--- a/src/ecmascript/timer.h
+++ b/src/ecmascript/timer.h
@@ -20,7 +20,7 @@ del_from_map_timer(struct timer *timer)
 }
 
 inline bool
-check_in_map_timer(struct timer *timer)
+found_in_map_timer(struct timer *timer)
 {
 	return map_timer.find(timer) != map_timer.end();
 }