diff --git a/exp-drd/tests/drd_bitmap_test.c b/exp-drd/tests/drd_bitmap_test.c
index fc3281181..4cda0ab04 100644
--- a/exp-drd/tests/drd_bitmap_test.c
+++ b/exp-drd/tests/drd_bitmap_test.c
@@ -1,4 +1,5 @@
 #include <assert.h>
+#include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include "coregrind/m_oset.c"