--- a/teensy_loader_cli.c
+++ b/teensy_loader_cli.c
@@ -1031,7 +1031,7 @@
 
 void delay(double seconds)
 {
-	#ifdef WIN32
+	#ifdef USE_WIN32
 	Sleep(seconds * 1000.0);
 	#else
 	usleep(seconds * 1000000.0);
@@ -1048,7 +1048,7 @@
 	exit(1);
 }
 
-#if defined(WIN32)
+#if defined(USE_WIN32)
 #define strcasecmp stricmp
 #endif
 
