diff --git a/Source/kwsys/Glob.cxx b/Source/kwsys/Glob.cxx
index 11cc596ad..d86b9e052 100644
--- a/Source/kwsys/Glob.cxx
+++ b/Source/kwsys/Glob.cxx
@@ -39,7 +39,7 @@
 #include <string.h>
 namespace KWSYS_NAMESPACE
 {
-#if defined(_WIN32) || defined(APPLE) || defined(__CYGWIN__)
+#if defined(_WIN32) || defined(__APPLE__) || defined(__CYGWIN__)
 // On Windows and apple, no difference between lower and upper case
 # define KWSYS_GLOB_CASE_INDEPENDENT
 #endif