diff --git a/libtransmission/libtransmission-test.c b/libtransmission/libtransmission-test.c
index 0ecd2ad0d..56dfeaa9d 100644
--- a/libtransmission/libtransmission-test.c
+++ b/libtransmission/libtransmission-test.c
@@ -2,6 +2,7 @@
 #include <stdio.h>
 
 #include "transmission.h"
+#include "platform.h" /* TR_PATH_DELIMETER */
 #include "torrent.h"
 #include "libtransmission-test.h"