diff --git a/platform/platform-impl/src/com/intellij/openapi/fileTypes/impl/FileTypeManagerImpl.java b/platform/platform-impl/src/com/intellij/openapi/fileTypes/impl/FileTypeManagerImpl.java
index 6f296f0693c9..f727550d7a5d 100644
--- a/platform/platform-impl/src/com/intellij/openapi/fileTypes/impl/FileTypeManagerImpl.java
+++ b/platform/platform-impl/src/com/intellij/openapi/fileTypes/impl/FileTypeManagerImpl.java
@@ -708,7 +708,7 @@ public class FileTypeManagerImpl extends FileTypeManagerEx implements Persistent
   @NotNull
   public FileType getFileTypeByFile(@NotNull VirtualFile file, @Nullable byte[] content) {
     FileType fileType = getByFile(file);
-    if ((fileType == null || fileType instanceof PlainTextLikeFileType) && file instanceof StubVirtualFile) {
+    if ((fileType == null || fileType instanceof PlainTextLikeFileType) && !(file instanceof StubVirtualFile)) {
       return getOrDetectFromContent(file, content);
     }
     return ObjectUtils.notNull(fileType, UnknownFileType.INSTANCE);