diff --git a/reactos/subsystems/win32/win32k/objects/gdiobj.c b/reactos/subsystems/win32/win32k/objects/gdiobj.c
index e172c4fa116..bb09071c759 100644
--- a/reactos/subsystems/win32/win32k/objects/gdiobj.c
+++ b/reactos/subsystems/win32/win32k/objects/gdiobj.c
@@ -1058,7 +1058,7 @@ GDIOBJ_ShareLockObj (HGDIOBJ hObj, DWORD ExpectedType)
                  RtlCaptureStackBackTrace(1, GDI_STACK_LEVELS, (PVOID*)GDIHandleLocker[HandleIndex], NULL);
             }
 #else
-            _InterlockedIncrement(Object->ulShareCount);
+            _InterlockedIncrement((PLONG)&Object->ulShareCount);
 #endif
          }
          else