diff --git a/bin/tests/lfsr_test.c b/bin/tests/lfsr_test.c
index de244ab326..cf8013a67a 100644
--- a/bin/tests/lfsr_test.c
+++ b/bin/tests/lfsr_test.c
@@ -20,6 +20,7 @@
 #include <isc/assertions.h>
 #include <isc/types.h>
 #include <isc/lfsr.h>
+#include <isc/util.h>
 
 isc_uint32_t state[1024 * 64];