diff --git a/dlls/quartz/acmwrapper.c b/dlls/quartz/acmwrapper.c
index 210ea1ee9c6..b4e32742659 100644
--- a/dlls/quartz/acmwrapper.c
+++ b/dlls/quartz/acmwrapper.c
@@ -228,7 +228,7 @@ static HRESULT ACMWrapper_ConnectInput(TransformFilterImpl* pTransformFilter, co
     }
 
     TRACE("Connection refused\n");
-    return S_FALSE;
+    return VFW_E_TYPE_NOT_ACCEPTED;
 }
 
 static HRESULT ACMWrapper_Cleanup(TransformFilterImpl* pTransformFilter)
diff --git a/dlls/quartz/avidec.c b/dlls/quartz/avidec.c
index 139e44df036..7f32288e8be 100644
--- a/dlls/quartz/avidec.c
+++ b/dlls/quartz/avidec.c
@@ -159,7 +159,7 @@ static HRESULT AVIDec_ProcessEnd(TransformFilterImpl* pTransformFilter)
 static HRESULT AVIDec_ConnectInput(TransformFilterImpl* pTransformFilter, const AM_MEDIA_TYPE * pmt)
 {
     AVIDecImpl* This = (AVIDecImpl*)pTransformFilter;
-    HRESULT hr = S_FALSE;
+    HRESULT hr = VFW_E_TYPE_NOT_ACCEPTED;
 
     TRACE("(%p)->(%p)\n", This, pmt);