diff --git a/src/mac/carbon/hid.cpp b/src/mac/carbon/hid.cpp
index 3d17c726bd..3dec1a481e 100644
--- a/src/mac/carbon/hid.cpp
+++ b/src/mac/carbon/hid.cpp
@@ -118,11 +118,11 @@ bool wxHIDDevice::Create (const int& nClass, const int& nType)
 	//Now get the maching services
 	io_iterator_t pIterator;
 	wxIOCHECK(IOServiceGetMatchingServices(m_pPort, pDictionary, &pIterator), "No Matching HID Services");
-	wxASSERT(pIterator != NULL);
+	wxASSERT(pIterator != 0);
 
 	//Now we iterate through them
 	io_object_t pObject;
-	while ( (pObject = IOIteratorNext(pIterator)) != NULL)
+	while ( (pObject = IOIteratorNext(pIterator)) != 0)
 	{
 		wxVERIFY(IORegistryEntryCreateCFProperties(pObject, &pDictionary,
 											kCFAllocatorDefault, kNilOptions) == KERN_SUCCESS);
diff --git a/src/mac/corefoundation/utilsexc_cf.cpp b/src/mac/corefoundation/utilsexc_cf.cpp
index a3f55509be..77c5ddbcc6 100644
--- a/src/mac/corefoundation/utilsexc_cf.cpp
+++ b/src/mac/corefoundation/utilsexc_cf.cpp
@@ -71,7 +71,7 @@ int wxAddProcessCallbackForPid(wxEndProcessData *proc_data, int pid)
         return -1;
     }
     CFMachPortContext termcb_contextinfo;
-    termcb_contextinfo.version = NULL;
+    termcb_contextinfo.version = 0;
     termcb_contextinfo.info = (void*)proc_data;
     termcb_contextinfo.retain = NULL;
     termcb_contextinfo.release = NULL;