diff --git a/controls/button.c b/controls/button.c
index 0826dc13f8c..5d87b8036fd 100644
--- a/controls/button.c
+++ b/controls/button.c
@@ -198,7 +198,7 @@ static LRESULT WINAPI ButtonWndProc_common(HWND hWnd, UINT uMsg,
             checkBoxWidth  = bmp.bmWidth / 4;
             checkBoxHeight = bmp.bmHeight / 3;
         }
-        if (btn_type < 0L || btn_type >= MAX_BTN_TYPE)
+        if (btn_type >= MAX_BTN_TYPE)
             return -1; /* abort */
         set_button_state( hWnd, BUTTON_UNCHECKED );
         return 0;
diff --git a/dlls/advapi32/crypt.c b/dlls/advapi32/crypt.c
index 90dfb8ea7a9..a1aa50e2696 100644
--- a/dlls/advapi32/crypt.c
+++ b/dlls/advapi32/crypt.c
@@ -842,7 +842,7 @@ BOOL WINAPI CryptGetDefaultProviderA (DWORD dwProvType, DWORD *pdwReserved,
 		CRYPT_ReturnLastError(ERROR_INVALID_PARAMETER);
 	if (dwFlags & ~(CRYPT_USER_DEFAULT | CRYPT_MACHINE_DEFAULT))
 		CRYPT_ReturnLastError(NTE_BAD_FLAGS);
-	if (dwProvType < 0 || dwProvType > 999)
+	if (dwProvType > 999)
 		CRYPT_ReturnLastError(NTE_BAD_PROV_TYPE);
 	if ( !(keyname = CRYPT_GetTypeKeyName(dwProvType, dwFlags & CRYPT_USER_DEFAULT)) )
 		CRYPT_ReturnLastError(ERROR_NOT_ENOUGH_MEMORY);
@@ -1129,7 +1129,7 @@ BOOL WINAPI CryptSetProviderExA (LPCSTR pszProvName, DWORD dwProvType, DWORD *pd
 
 	if (!pszProvName || pdwReserved)
 		CRYPT_ReturnLastError(ERROR_INVALID_PARAMETER);
-	if (dwProvType < 0 || dwProvType > MAXPROVTYPES)
+	if (dwProvType > MAXPROVTYPES)
 		CRYPT_ReturnLastError(NTE_BAD_PROV_TYPE);
 	if (dwFlags & ~(CRYPT_MACHINE_DEFAULT | CRYPT_USER_DEFAULT | CRYPT_DELETE_DEFAULT)
 			|| dwFlags == CRYPT_DELETE_DEFAULT)
diff --git a/dlls/comctl32/listview.c b/dlls/comctl32/listview.c
index d2a5b685ab3..fdfd7d91de0 100644
--- a/dlls/comctl32/listview.c
+++ b/dlls/comctl32/listview.c
@@ -1832,10 +1832,10 @@ static VOID LISTVIEW_ShiftIndices(HWND hwnd, INT nItem, INT direction)
   {
     checkselection = DPA_GetPtr(infoPtr->hdpaSelectionRanges,index);
     if ((checkselection->lower >= nItem)&&
-       (checkselection->lower + direction >= 0))
+       ((int)(checkselection->lower + direction) >= 0))
         checkselection->lower += direction;
     if ((checkselection->upper >= nItem)&&
-       (checkselection->upper + direction >=0))
+       ((int)(checkselection->upper + direction) >= 0))
         checkselection->upper += direction;
     index ++;
   }
diff --git a/dlls/ole32/oleobj.c b/dlls/ole32/oleobj.c
index 80a90b47b11..67b867f3314 100644
--- a/dlls/ole32/oleobj.c
+++ b/dlls/ole32/oleobj.c
@@ -288,8 +288,7 @@ static HRESULT WINAPI OleAdviseHolderImpl_Unadvise(
   /*
    * Check for invalid cookies.
    */
-  if ( (dwConnection < 0) ||
-       (dwConnection >= This->maxSinks) )
+  if (dwConnection >= This->maxSinks)
     return OLE_E_NOCONNECTION;
 
   if (This->arrayOfSinks[dwConnection] == NULL)
@@ -647,8 +646,7 @@ static HRESULT WINAPI     DataAdviseHolder_Unadvise(
   /*
    * Check for invalid cookies.
    */
-  if ( (dwConnection < 0) ||
-       (dwConnection >= This->maxCons) )
+  if (dwConnection >= This->maxCons)
     return OLE_E_NOCONNECTION;
 
   if (This->Connections[dwConnection].sink == NULL)
diff --git a/dlls/oleaut32/variant.c b/dlls/oleaut32/variant.c
index 7ba62ad19e3..97df765a2b8 100644
--- a/dlls/oleaut32/variant.c
+++ b/dlls/oleaut32/variant.c
@@ -4067,7 +4067,7 @@ HRESULT WINAPI VarUI2FromUI4(ULONG ulIn, USHORT* puiOut)
 {
 	TRACE("( %ld, %p ), stub\n", ulIn, puiOut );
 
-	if( ulIn < UI2_MIN || ulIn > UI2_MAX )
+	if( ulIn > UI2_MAX )
 	{
 		return DISP_E_OVERFLOW;
 	}
@@ -4167,7 +4167,7 @@ HRESULT WINAPI VarUI4FromI4(LONG lIn, ULONG* pulOut)
 {
 	TRACE("( %ld, %p ), stub\n", lIn, pulOut );
 
-	if( lIn < UI4_MIN )
+	if( lIn < 0 )
 	{
 		return DISP_E_OVERFLOW;
 	}
@@ -4885,7 +4885,7 @@ HRESULT WINAPI VarDateFromUdate(UDATE *pudateout,
  */
 HRESULT WINAPI VarBstrCmp(BSTR left, BSTR right, LCID lcid, DWORD flags)
 {
-    DWORD r;
+    INT r;
 
     TRACE("( %s %s %ld %lx ) partial stub\n", debugstr_w(left), debugstr_w(right), lcid, flags);
 
diff --git a/dlls/x11drv/winpos.c b/dlls/x11drv/winpos.c
index dd3df9b6692..1f84a0b3e66 100644
--- a/dlls/x11drv/winpos.c
+++ b/dlls/x11drv/winpos.c
@@ -1407,7 +1407,7 @@ static Window __get_top_decoration( Display *display, Window w, Window ancestor
 static unsigned __td_lookup( Window w, Window* list, unsigned max )
 {
     unsigned    i;
-    for( i = max - 1; i >= 0; i-- ) if( list[i] == w ) break;
+    for( i = max; i > 0; i-- ) if( list[i - 1] == w ) break;
     return i;
 }