@@ -49,11 +49,11 @@
 OF_CONSTRUCTOR()
 {
 	hashtable = objc_hashtable_new(hash, equal, 2);
 
 #ifdef OF_HAVE_THREADS
-	if (!of_spinlock_new(&spinlock))
+	if (of_spinlock_new(&spinlock) != 0)
 		OBJC_ERROR("Failed to create spinlock!");
 #endif
 }
 
 id
@@ -120,11 +120,11 @@
 objc_storeWeak(id *object, id value)
 {
 	struct weak_ref *old;
 
 #ifdef OF_HAVE_THREADS
-	if (!of_spinlock_lock(&spinlock))
+	if (of_spinlock_lock(&spinlock) != 0)
 		OBJC_ERROR("Failed to lock spinlock!");
 #endif
 
 	if (*object != nil &&
 	    (old = objc_hashtable_get(hashtable, *object)) != NULL) {
@@ -177,11 +177,11 @@
 		value = nil;
 
 	*object = value;
 
 #ifdef OF_HAVE_THREADS
-	if (!of_spinlock_unlock(&spinlock))
+	if (of_spinlock_unlock(&spinlock) != 0)
 		OBJC_ERROR("Failed to unlock spinlock!");
 #endif
 
 	return value;
 }
@@ -191,20 +191,20 @@
 {
 	id value = nil;
 	struct weak_ref *ref;
 
 #ifdef OF_HAVE_THREADS
-	if (!of_spinlock_lock(&spinlock))
+	if (of_spinlock_lock(&spinlock) != 0)
 		OBJC_ERROR("Failed to lock spinlock!");
 #endif
 
 	if (*object != nil &&
 	    (ref = objc_hashtable_get(hashtable, *object)) != NULL)
 		value = *object;
 
 #ifdef OF_HAVE_THREADS
-	if (!of_spinlock_unlock(&spinlock))
+	if (of_spinlock_unlock(&spinlock) != 0)
 		OBJC_ERROR("Failed to unlock spinlock!");
 #endif
 
 	if (class_respondsToSelector(object_getClass(value),
 	    @selector(retainWeakReference)) && [value retainWeakReference])
@@ -242,11 +242,11 @@
 objc_moveWeak(id *dest, id *src)
 {
 	struct weak_ref *ref;
 
 #ifdef OF_HAVE_THREADS
-	if (!of_spinlock_lock(&spinlock))
+	if (of_spinlock_lock(&spinlock) != 0)
 		OBJC_ERROR("Failed to lock spinlock!");
 #endif
 
 	if (*src != nil &&
 	    (ref = objc_hashtable_get(hashtable, *src)) != NULL) {
@@ -260,11 +260,11 @@
 
 	*dest = *src;
 	*src = nil;
 
 #ifdef OF_HAVE_THREADS
-	if (!of_spinlock_unlock(&spinlock))
+	if (of_spinlock_unlock(&spinlock) != 0)
 		OBJC_ERROR("Failed to unlock spinlock!");
 #endif
 }
 
 void
@@ -271,11 +271,11 @@
 objc_zero_weak_references(id value)
 {
 	struct weak_ref *ref;
 
 #ifdef OF_HAVE_THREADS
-	if (!of_spinlock_lock(&spinlock))
+	if (of_spinlock_lock(&spinlock) != 0)
 		OBJC_ERROR("Failed to lock spinlock!");
 #endif
 
 	if ((ref = objc_hashtable_get(hashtable, value)) != NULL) {
 		for (size_t i = 0; i < ref->count; i++)
@@ -285,9 +285,9 @@
 		free(ref->locations);
 		free(ref);
 	}
 
 #ifdef OF_HAVE_THREADS
-	if (!of_spinlock_unlock(&spinlock))
+	if (of_spinlock_unlock(&spinlock) != 0)
 		OBJC_ERROR("Failed to unlock spinlock!");
 #endif
 }