diff --git a/dlls/urlmon/sec_mgr.c b/dlls/urlmon/sec_mgr.c
index e82c6579217..4017891820a 100644
--- a/dlls/urlmon/sec_mgr.c
+++ b/dlls/urlmon/sec_mgr.c
@@ -43,7 +43,7 @@ typedef struct SecManagerImpl{
 
     const IInternetSecurityManagerVtbl* lpvtbl1;  /* VTable relative to the IInternetSecurityManager interface.*/
 
-    ULONG ref; /* reference counter for this object */
+    LONG ref; /* reference counter for this object */
 
 } SecManagerImpl;
 
@@ -210,7 +210,7 @@ HRESULT SecManagerImpl_Construct(IUnknown *pUnkOuter, LPVOID *ppobj)
  */
 typedef struct {
     const IInternetZoneManagerVtbl* lpVtbl;
-    ULONG ref;
+    LONG ref;
 } ZoneMgrImpl;
 
 /********************************************************************
diff --git a/dlls/urlmon/umon.c b/dlls/urlmon/umon.c
index 70e4d347779..a6bf5fe4b63 100644
--- a/dlls/urlmon/umon.c
+++ b/dlls/urlmon/umon.c
@@ -51,7 +51,7 @@ static const WCHAR BSCBHolder[] = { '_','B','S','C','B','_','H','o','l','d','e',
 typedef struct {
     const IBindingVtbl *lpVtbl;
 
-    ULONG ref;
+    LONG ref;
 
     LPWSTR URLName;
 
@@ -291,7 +291,7 @@ typedef struct {
 
     const IMonikerVtbl* lpvtbl;  /* VTable relative to the IMoniker interface.*/
 
-    ULONG ref; /* reference counter for this object */
+    LONG ref; /* reference counter for this object */
 
     LPOLESTR URLName; /* URL string identified by this URLmoniker */
 } URLMonikerImpl;
diff --git a/dlls/urlmon/umstream.c b/dlls/urlmon/umstream.c
index da9e8f2cc65..f9073175424 100644
--- a/dlls/urlmon/umstream.c
+++ b/dlls/urlmon/umstream.c
@@ -253,7 +253,8 @@ static HRESULT WINAPI IStream_fnSeek (       IStream * iface,
                                    DWORD dwOrigin,
                                    ULARGE_INTEGER* plibNewPosition)
 {
-    DWORD pos, newposlo, newposhi;
+    DWORD pos, newposlo;
+    LONG newposhi;
 
     IUMCacheStream *This = (IUMCacheStream *)iface;
 
@@ -262,7 +263,7 @@ static HRESULT WINAPI IStream_fnSeek (       IStream * iface,
     pos = dlibMove.QuadPart; /* FIXME: truncates */
     newposhi = 0;
     newposlo = SetFilePointer( This->handle, pos, &newposhi, dwOrigin );
-    if( newposlo == INVALID_SET_FILE_POINTER )
+    if( newposlo == INVALID_SET_FILE_POINTER && GetLastError())
        return E_FAIL;
 
     if (plibNewPosition)
diff --git a/dlls/urlmon/urlmon_main.c b/dlls/urlmon/urlmon_main.c
index 3a949c05a6f..b3dcc15851b 100644
--- a/dlls/urlmon/urlmon_main.c
+++ b/dlls/urlmon/urlmon_main.c
@@ -89,7 +89,7 @@ HRESULT WINAPI URLMON_DllCanUnloadNow(void)
 typedef struct {
     IClassFactory ITF_IClassFactory;
 
-    DWORD ref;
+    LONG ref;
     HRESULT (*pfnCreateInstance)(IUnknown *pUnkOuter, LPVOID *ppObj);
 } IClassFactoryImpl;
 
diff --git a/dlls/urlmon/urlmon_main.h b/dlls/urlmon/urlmon_main.h
index e1ce8734333..9a6093dc134 100644
--- a/dlls/urlmon/urlmon_main.h
+++ b/dlls/urlmon/urlmon_main.h
@@ -40,7 +40,7 @@ static inline void URLMON_UnlockModule(void) { InterlockedDecrement( &URLMON_ref
 typedef struct
 {	
 	const IStreamVtbl	*lpVtbl;
-	DWORD		ref;
+	LONG		ref;
 	HANDLE		handle;
 	BOOL		closed;
 	WCHAR		*pszFileName;