diff --git a/tests/dns/diff_test.c b/tests/dns/diff_test.c
index 66d6d9b015..ea7785db29 100644
--- a/tests/dns/diff_test.c
+++ b/tests/dns/diff_test.c
@@ -19,13 +19,14 @@
 #include <stdlib.h>
 #include <unistd.h>
 
-#include "isc/list.h"
-
 #define UNIT_TESTING
 #include <cmocka.h>
 
 #include <dns/diff.h>
 
+/* isc/list.h must be imported after cmocka to avoid redefinition errors */
+#include <isc/list.h>
+
 #include <tests/dns.h>
 
 unsigned char data_1[] = "\006name_1";