diff --git a/libtransmission/utils-test.c b/libtransmission/utils-test.c
index fa547cf9b..afa7a6aca 100644
--- a/libtransmission/utils-test.c
+++ b/libtransmission/utils-test.c
@@ -2,6 +2,7 @@
 #include <string.h> /* strcmp */
 #include "transmission.h"
 #include "utils.h"
+#include "crypto.h"
 
 #define VERBOSE 0
 #define NUM_LOOPS 1