diff --git a/dlls/msctf/context.c b/dlls/msctf/context.c
index 38d8ad6218..dff4fd88f9 100644
--- a/dlls/msctf/context.c
+++ b/dlls/msctf/context.c
@@ -58,6 +58,13 @@ typedef struct tagContextSink {
 typedef struct tagContext {
     const ITfContextVtbl *ContextVtbl;
     const ITfSourceVtbl *SourceVtbl;
+    /* const ITfContextCompositionVtbl *ContextCompositionVtbl; */
+    /* const ITfContextOwnerCompositionServicesVtbl *ContextOwnerCompositionServicesVtbl; */
+    /* const ITfContextOwnerServicesVtbl *ContextOwnerServicesVtbl; */
+    /* const ITfInsertAtSelectionVtbl *InsertAtSelectionVtbl; */
+    /* const ITfMouseTrackerVtbl *MouseTrackerVtbl; */
+    /* const ITfQueryEmbeddedVtbl *QueryEmbeddedVtbl; */
+    /* const ITfSourceSingleVtbl *SourceSingleVtbl; */
     LONG refCount;
 
     TfClientId tidOwner;
@@ -79,6 +86,7 @@ typedef struct tagContext {
 
 typedef struct tagTextStoreACPSink {
     const ITextStoreACPSinkVtbl *TextStoreACPSinkVtbl;
+    /* const ITextStoreACPServicesVtbl *TextStoreACPServicesVtbl; */
     LONG refCount;
 
     Context *pContext;
diff --git a/dlls/msctf/inputprocessor.c b/dlls/msctf/inputprocessor.c
index 8d36cd5264..90daa2fb47 100644
--- a/dlls/msctf/inputprocessor.c
+++ b/dlls/msctf/inputprocessor.c
@@ -59,6 +59,9 @@ typedef struct tagInputProcessorProfilesSink {
 typedef struct tagInputProcessorProfiles {
     const ITfInputProcessorProfilesVtbl *InputProcessorProfilesVtbl;
     const ITfSourceVtbl *SourceVtbl;
+    /* const ITfInputProcessorProfileMgrVtbl *InputProcessorProfileMgrVtbl; */
+    /* const ITfInputProcessorProfilesExVtbl *InputProcessorProfilesExVtbl; */
+    /* const ITfInputProcessorProfileSubstituteLayoutVtbl *InputProcessorProfileSubstituteLayoutVtbl; */
     LONG refCount;
 
     LANGID  currentLanguage;
diff --git a/dlls/msctf/threadmgr.c b/dlls/msctf/threadmgr.c
index 277923e96e..c91e536107 100644
--- a/dlls/msctf/threadmgr.c
+++ b/dlls/msctf/threadmgr.c
@@ -71,6 +71,11 @@ typedef struct tagACLMulti {
     const ITfKeystrokeMgrVtbl *KeystrokeMgrVtbl;
     const ITfMessagePumpVtbl *MessagePumpVtbl;
     const ITfClientIdVtbl *ClientIdVtbl;
+    /* const ITfThreadMgrExVtbl *ThreadMgrExVtbl; */
+    /* const ITfConfigureSystemKeystrokeFeedVtbl *ConfigureSystemKeystrokeFeedVtbl; */
+    /* const ITfLangBarItemMgrVtbl *LangBarItemMgrVtbl; */
+    /* const ITfUIElementMgrVtbl *UIElementMgrVtbl; */
+    /* const ITfSourceSingleVtbl *SourceSingleVtbl; */
     LONG refCount;
 
     const ITfThreadMgrEventSinkVtbl *ThreadMgrEventSinkVtbl; /* internal */