diff --git a/loader/dshow/DS_VideoDecoder.c b/loader/dshow/DS_VideoDecoder.c
index de2e81b83d..248938dbf3 100644
--- a/loader/dshow/DS_VideoDecoder.c
+++ b/loader/dshow/DS_VideoDecoder.c
@@ -114,6 +114,7 @@ DS_VideoDecoder * DS_VideoDecoder_Open(char* dllname, GUID* guid, BITMAPINFOHEAD
      
         this->iv.m_bh = malloc(bihs);
         memcpy(this->iv.m_bh, format, bihs);
+        this->iv.m_bh->biSize = bihs;
 
         this->iv.m_State = STOP;
         //this->iv.m_pFrame = 0;