diff --git a/src/random.cpp b/src/random.cpp
index 491272d5f35..fee6c2d92aa 100644
--- a/src/random.cpp
+++ b/src/random.cpp
@@ -34,6 +34,7 @@
 #include <sys/random.h>
 #endif
 #ifdef HAVE_SYSCTL_ARND
+#include <utilstrencodings.h> // for ARRAYLEN
 #include <sys/sysctl.h>
 #endif