diff --git a/src/lj_arch.h b/src/lj_arch.h
index 026e741f..e6264398 100644
--- a/src/lj_arch.h
+++ b/src/lj_arch.h
@@ -124,7 +124,7 @@
 #define LJ_TARGET_POSIX		(LUAJIT_OS > LUAJIT_OS_WINDOWS)
 #define LJ_TARGET_DLOPEN	LJ_TARGET_POSIX
 
-#if TARGET_OS_IPHONE
+#if defined(TARGET_OS_IPHONE) && TARGET_OS_IPHONE
 #define LJ_TARGET_IOS		1
 #else
 #define LJ_TARGET_IOS		0