diff --git a/ext/win32ole/win32ole.c b/ext/win32ole/win32ole.c
index 179b6362db..9518e2f0cd 100644
--- a/ext/win32ole/win32ole.c
+++ b/ext/win32ole/win32ole.c
@@ -42,7 +42,7 @@ static RB_THREAD_SPECIFIC BOOL g_ole_initialized;
 # define g_ole_initialized_set(val) (g_ole_initialized = (val))
 #else
 static volatile DWORD g_ole_initialized_key = TLS_OUT_OF_INDEXES;
-# define g_ole_initialized (BOOL)TlsGetValue(g_ole_initialized_key)
+# define g_ole_initialized (TlsGetValue(g_ole_initialized_key)!=0)
 # define g_ole_initialized_init() (g_ole_initialized_key = TlsAlloc())
 # define g_ole_initialized_set(val) TlsSetValue(g_ole_initialized_key, (void*)(val))
 #endif