diff --git a/dlls/ddraw/ddraw/user.h b/dlls/ddraw/ddraw/user.h
index 7cd70ae277e..477a990cf0a 100644
--- a/dlls/ddraw/ddraw/user.h
+++ b/dlls/ddraw/ddraw/user.h
@@ -25,6 +25,7 @@
 
 typedef struct
 {
+    int empty;
     /* empty */
 } User_DirectDrawImpl_Part;
 
diff --git a/dlls/ddraw/dsurface/fakezbuffer.h b/dlls/ddraw/dsurface/fakezbuffer.h
index 4c7074aeb94..a7867c6ee13 100644
--- a/dlls/ddraw/dsurface/fakezbuffer.h
+++ b/dlls/ddraw/dsurface/fakezbuffer.h
@@ -21,6 +21,7 @@
 
 struct FakeZBuffer_DirectDrawSurfaceImpl_Part
 {
+  int dummy;
 };
 
 typedef struct
diff --git a/include/ntddk.h b/include/ntddk.h
index 918699fbff8..90e6ca13e91 100644
--- a/include/ntddk.h
+++ b/include/ntddk.h
@@ -334,7 +334,7 @@ typedef struct {
         DWORD dwPrivateBytes;
         DWORD dwPageFileBytes;
         DWORD dwUnknown7[4];
-        THREADINFO ti[0];
+        THREADINFO ti[1];
 } SYSTEM_PROCESS_INFORMATION;
 
 typedef struct {
diff --git a/tools/winedump/cvinclude.h b/tools/winedump/cvinclude.h
index a0420ef75f8..29cfd591196 100644
--- a/tools/winedump/cvinclude.h
+++ b/tools/winedump/cvinclude.h
@@ -154,7 +154,7 @@ typedef struct OMFSegMap
 {
     unsigned short  cSeg;
     unsigned short  cSegLog;
-    OMFSegMapDesc   rgDesc[0];
+/*    OMFSegMapDesc   rgDesc[0];*/
 } OMFSegMap;
 
 
@@ -185,4 +185,3 @@ typedef struct OMFSourceModule
     unsigned short  cSeg;
     unsigned long   baseSrcFile[1];
 } OMFSourceModule;
-