diff --git a/src/webgpu/format_info.ts b/src/webgpu/format_info.ts
index 9b6fd713de70..64ef2cd8956d 100644
--- a/src/webgpu/format_info.ts
+++ b/src/webgpu/format_info.ts
@@ -1942,7 +1942,7 @@ export function isTextureFormatUsableAsStorageFormat(
   isCompatibilityMode: boolean
 ) {
   if (isCompatibilityMode) {
-    if (kCompatModeUnsupportedStorageTextureFormats.indexOf(format)) {
+    if (kCompatModeUnsupportedStorageTextureFormats.indexOf(format) >= 0) {
       return false;
     }
   }