diff --git a/src/lib/kadm5/unit-test/randkey-test.c b/src/lib/kadm5/unit-test/randkey-test.c
index 0145df326e..4b17bcb223 100644
--- a/src/lib/kadm5/unit-test/randkey-test.c
+++ b/src/lib/kadm5/unit-test/randkey-test.c
@@ -4,6 +4,7 @@
 #include <krb5.h>
 #include <sys/socket.h>
 #include <netinet/in.h>
+#include <string.h>
 
 #define	TEST_NUM    1000