diff --git a/src/unix/process.c b/src/unix/process.c
index ccb6e9a3..ffe01451 100644
--- a/src/unix/process.c
+++ b/src/unix/process.c
@@ -34,7 +34,7 @@
 # include <TargetConditionals.h>
 #endif
 
-#if defined(__APPLE__) && !defined(TARGET_OS_IPHONE)
+#if defined(__APPLE__) && !TARGET_OS_IPHONE
 # include <crt_externs.h>
 # define environ (*_NSGetEnviron())
 #else