diff --git a/dlls/ole32/antimoniker.c b/dlls/ole32/antimoniker.c
index 92e28530e96..7f040363499 100644
--- a/dlls/ole32/antimoniker.c
+++ b/dlls/ole32/antimoniker.c
@@ -67,7 +67,7 @@ AntiMonikerImpl_QueryInterface(IMoniker* iface,REFIID riid,void** ppvObject)
     TRACE("(%p,%p,%p)\n",This,riid,ppvObject);
 
     /* Perform a sanity check on the parameters.*/
-    if ( (This==0) || (ppvObject==0) )
+    if ( ppvObject==0 )
 	return E_INVALIDARG;
 
     /* Initialize the return parameter */
diff --git a/dlls/ole32/compositemoniker.c b/dlls/ole32/compositemoniker.c
index 275d875362b..f7d6ee6cdda 100644
--- a/dlls/ole32/compositemoniker.c
+++ b/dlls/ole32/compositemoniker.c
@@ -101,7 +101,7 @@ CompositeMonikerImpl_QueryInterface(IMoniker* iface,REFIID riid,void** ppvObject
     TRACE("(%p,%p,%p)\n",This,riid,ppvObject);
 
     /* Perform a sanity check on the parameters.*/
-    if ( (This==0) || (ppvObject==0) )
+    if ( ppvObject==0 )
 	return E_INVALIDARG;
 
     /* Initialize the return parameter */
@@ -1504,7 +1504,7 @@ EnumMonikerImpl_QueryInterface(IEnumMoniker* iface,REFIID riid,void** ppvObject)
     TRACE("(%p,%p,%p)\n",This,riid,ppvObject);
 
     /* Perform a sanity check on the parameters.*/
-    if ( (This==0) || (ppvObject==0) )
+    if ( ppvObject==0 )
 	return E_INVALIDARG;
 
     /* Initialize the return parameter */
diff --git a/dlls/ole32/enumx.c b/dlls/ole32/enumx.c
index 26653014984..4279ca81fa9 100644
--- a/dlls/ole32/enumx.c
+++ b/dlls/ole32/enumx.c
@@ -51,7 +51,7 @@ HRESULT WINAPI enumx_QueryInterface(
     REFIID riid,
     void** ppvObject)
 {
-    if ( (This==0) || (ppvObject==0) )
+    if ( ppvObject==0 )
         return E_INVALIDARG;
 
     *ppvObject = 0;
diff --git a/dlls/ole32/filemoniker.c b/dlls/ole32/filemoniker.c
index 01ae5d1d9e7..0cbfc3aee91 100644
--- a/dlls/ole32/filemoniker.c
+++ b/dlls/ole32/filemoniker.c
@@ -77,7 +77,7 @@ FileMonikerImpl_QueryInterface(IMoniker* iface,REFIID riid,void** ppvObject)
     TRACE("(%p,%s,%p)\n",This,debugstr_guid(riid),ppvObject);
 
     /* Perform a sanity check on the parameters.*/
-    if ( (This==0) || (ppvObject==0) )
+    if ( ppvObject==0 )
 	return E_INVALIDARG;
 
     /* Initialize the return parameter */
@@ -1450,7 +1450,7 @@ HRESULT WINAPI CreateFileMoniker(LPCOLESTR lpszPathName, LPMONIKER * ppmk)
     hr = FileMonikerImpl_Construct(newFileMoniker,lpszPathName);
 
     if (SUCCEEDED(hr))
-	hr = FileMonikerImpl_QueryInterface((IMoniker*)newFileMoniker,&IID_IMoniker,(void**)ppmk);
+	hr = IMoniker_QueryInterface((IMoniker*)newFileMoniker,&IID_IMoniker,(void**)ppmk);
     else
         HeapFree(GetProcessHeap(),0,newFileMoniker);
 
@@ -1600,7 +1600,7 @@ static HRESULT WINAPI FileMonikerCF_CreateInstance(LPCLASSFACTORY iface,
     hr = FileMonikerImpl_Construct(newFileMoniker, wszEmpty);
 
     if (SUCCEEDED(hr))
-	hr = FileMonikerImpl_QueryInterface((IMoniker*)newFileMoniker, riid, ppv);
+	hr = IMoniker_QueryInterface((IMoniker*)newFileMoniker, riid, ppv);
     if (FAILED(hr))
         HeapFree(GetProcessHeap(),0,newFileMoniker);