diff --git a/tools/testing/selftests/mm/hmm-tests.c b/tools/testing/selftests/mm/hmm-tests.c
index e4c49699f3f7..2f2b9879d100 100644
--- a/tools/testing/selftests/mm/hmm-tests.c
+++ b/tools/testing/selftests/mm/hmm-tests.c
@@ -23,6 +23,7 @@
 #include <time.h>
 #include <pthread.h>
 #include <limits.h>
+#include <linux/mman.h>
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <sys/mman.h>