diff --git a/dlls/quartz/tests/filtergraph.c b/dlls/quartz/tests/filtergraph.c
index 53f39d5..e3ae100 100644
--- a/dlls/quartz/tests/filtergraph.c
+++ b/dlls/quartz/tests/filtergraph.c
@@ -400,9 +400,9 @@
     *ppv = NULL;
 
     if (IsEqualIID(riid, &IID_IUnknown))
-        *ppv = (LPVOID)iface;
+        *ppv = iface;
     else if (IsEqualIID(riid, &IID_IEnumMediaTypes))
-        *ppv = (LPVOID)iface;
+        *ppv = iface;
 
     if (*ppv)
     {
@@ -535,9 +535,9 @@
     *ppv = NULL;
 
     if (IsEqualIID(riid, &IID_IUnknown))
-        *ppv = (LPVOID)iface;
+        *ppv = iface;
     else if (IsEqualIID(riid, &IID_IPin))
-        *ppv = (LPVOID)iface;
+        *ppv = iface;
 
     if (*ppv)
     {
@@ -912,9 +912,9 @@
     *ppv = NULL;
 
     if (IsEqualIID(riid, &IID_IUnknown))
-        *ppv = (LPVOID)iface;
+        *ppv = iface;
     else if (IsEqualIID(riid, &IID_IEnumPins))
-        *ppv = (LPVOID)iface;
+        *ppv = iface;
 
     if (*ppv)
     {
@@ -1121,7 +1121,7 @@
     }
 
     pTestFilter->nPins = nPins;
-    *ppv = (LPVOID)pTestFilter;
+    *ppv = pTestFilter;
     return S_OK;
 
     error:
@@ -1147,13 +1147,13 @@
     *ppv = NULL;
 
     if (IsEqualIID(riid, &IID_IUnknown))
-        *ppv = (LPVOID)This;
+        *ppv = This;
     else if (IsEqualIID(riid, &IID_IPersist))
-        *ppv = (LPVOID)This;
+        *ppv = This;
     else if (IsEqualIID(riid, &IID_IMediaFilter))
-        *ppv = (LPVOID)This;
+        *ppv = This;
     else if (IsEqualIID(riid, &IID_IBaseFilter))
-        *ppv = (LPVOID)This;
+        *ppv = This;
 
     if (*ppv)
     {
@@ -1359,7 +1359,7 @@
     if (IsEqualGUID(riid, &IID_IUnknown) ||
         IsEqualGUID(riid, &IID_IClassFactory))
     {
-        *ppvObj = (LPVOID)iface;
+        *ppvObj = iface;
         IClassFactory_AddRef(iface);
         return S_OK;
     }
diff --git a/dlls/quartz/tests/filtermapper.c b/dlls/quartz/tests/filtermapper.c
index 3025b18..f7d47ab 100644
--- a/dlls/quartz/tests/filtermapper.c
+++ b/dlls/quartz/tests/filtermapper.c
@@ -59,7 +59,7 @@
         {
             CHAR val1[512], val2[512];
 
-            WideCharToMultiByte(CP_ACP, 0, (WCHAR*)V_UNION(&var, bstrVal), -1, val1, sizeof(val1), 0, 0);
+            WideCharToMultiByte(CP_ACP, 0, V_UNION(&var, bstrVal), -1, val1, sizeof(val1), 0, 0);
             WideCharToMultiByte(CP_ACP, 0, wszFilterName, -1, val2, sizeof(val2), 0, 0);
             if (!lstrcmpA(val1, val2)) found = TRUE;
         }