diff --git a/dep/CascLib/src/CascDecrypt.cpp b/dep/CascLib/src/CascDecrypt.cpp
index ec29bb4cb07..043d8effa66 100644
--- a/dep/CascLib/src/CascDecrypt.cpp
+++ b/dep/CascLib/src/CascDecrypt.cpp
@@ -525,7 +525,7 @@ LPBYTE WINAPI CascFindEncryptionKey(HANDLE hStorage, ULONGLONG KeyName)
     if (hs == NULL)
     {
         SetLastError(ERROR_INVALID_HANDLE);
-        return false;
+        return NULL;
     }
 
     return CascFindKey(hs, KeyName);