diff --git a/dlls/avifil32/avifile.c b/dlls/avifil32/avifile.c
index 2486611c0c3..2d39659ea51 100644
--- a/dlls/avifil32/avifile.c
+++ b/dlls/avifil32/avifile.c
@@ -2036,7 +2036,7 @@ static HRESULT AVIFILE_ReadBlock(IAVIStreamImpl *This, DWORD pos,
 	This->lpBuffer = HeapReAlloc(GetProcessHeap(), 0, This->lpBuffer, maxSize);
       if (This->lpBuffer == NULL)
 	return AVIERR_MEMORY;
-      This->cbBuffer = max(size, This->sInfo.dwSuggestedBufferSize);
+      This->cbBuffer = maxSize;
     }
 
     /* now read the complete chunk into our buffer */