diff --git a/src/js/quickjs/input.c b/src/js/quickjs/input.c
index 1f19f1573..980a6d469 100644
--- a/src/js/quickjs/input.c
+++ b/src/js/quickjs/input.c
@@ -104,15 +104,20 @@ string_get(const JSString *p, int idx)
 /* Convert the string *@vp to an access key.  Return 0 for no access
  * key, UCS_NO_CHAR on error, or the access key otherwise.  */
 static unicode_val_T
-js_value_to_accesskey(JSValueConst val)
+js_value_to_accesskey(JSContext *ctx, JSValueConst val)
 {
 	ELOG
 #ifdef ECMASCRIPT_DEBUG
 	fprintf(stderr, "%s:%s\n", __FILE__, __FUNCTION__);
 #endif
 	REF_JS(val);
+	unicode_val_T ret = UCS_NO_CHAR; /* which the caller will reject */
 
-	JSString *p = JS_VALUE_GET_STRING(val);
+	const char *str = JS_ToCString(ctx, val);
+	JSValue new_val = JS_NewString(ctx, str);
+	JS_FreeCString(ctx, str);
+
+	JSString *p = JS_VALUE_GET_STRING(new_val);
 
 	size_t len;
 	uint16_t chr[2];
@@ -120,21 +125,26 @@ js_value_to_accesskey(JSValueConst val)
 	len = p->len;
 
 	/* This implementation ignores extra characters in the string.  */
-	if (len < 1)
-		return 0;	/* which means no access key */
+	if (len < 1) {
+		ret = 0; /* which means no access key */
+		goto end;
+	}
 	chr[0] = string_get(p, 0);
 
 	if (!is_utf16_surrogate(chr[0])) {
-		return chr[0];
+		ret = chr[0];
+		goto end;
 	}
 	if (len >= 2) {
 		chr[1] = string_get(p, 1);
 		if (is_utf16_high_surrogate(chr[0])
 			&& is_utf16_low_surrogate(chr[1])) {
-			return join_utf16_surrogates(chr[0], chr[1]);
+			ret = join_utf16_surrogates(chr[0], chr[1]);
 		}
 	}
-	return UCS_NO_CHAR;	/* which the caller will reject */
+end:
+	JS_FreeValue(ctx, new_val);
+	return ret;
 }
 
 static JSValue
@@ -244,7 +254,7 @@ js_input_set_property_accessKey(JSContext *ctx, JSValueConst this_val, JSValue v
 #endif
 		return JS_NULL;
 	}
-	accesskey = js_value_to_accesskey(val);
+	accesskey = js_value_to_accesskey(ctx, val);
 
 	if (link) {
 		link->accesskey = accesskey;