--- libmalloc/libmalloc-166.251.2/src/nanov2_zone.h
+++ libmalloc/libmalloc-283/src/nanov2_zone.h
@@ -29,21 +29,21 @@
 #pragma mark -
 #pragma mark Address Structure
 
-#if TARGET_OS_OSX || TARGET_OS_SIMULATOR
+#if TARGET_OS_OSX || TARGET_OS_SIMULATOR || TARGET_OS_DRIVERKIT
 
 #define NANOV2_REGION_BITS		15
 #define NANOV2_ARENA_BITS		3
 #define NANOV2_BLOCK_BITS		12
 #define NANOV2_OFFSET_BITS		14
 
-#else // TARGET_OS_OSX || TARGET_OS_SIMULATOR
+#else // TARGET_OS_OSX || TARGET_OS_SIMULATOR || TARGET_OS_DRIVERKIT
 
 #define NANOV2_REGION_BITS		0
 #define NANOV2_ARENA_BITS		3
 #define NANOV2_BLOCK_BITS		12
 #define NANOV2_OFFSET_BITS		14
 
-#endif // TARGET_OS_OSX || TARGET_OS_SIMULATOR
+#endif // TARGET_OS_OSX || TARGET_OS_SIMULATOR || TARGET_OS_DRIVERKIT
 
 #if NANOV2_REGION_BITS > 0
 #define NANOV2_MULTIPLE_REGIONS	1