diff --git a/tests/unit/core/test-core-hashtable.cpp b/tests/unit/core/test-core-hashtable.cpp
index 2e209847c..5acc3ce75 100644
--- a/tests/unit/core/test-core-hashtable.cpp
+++ b/tests/unit/core/test-core-hashtable.cpp
@@ -23,6 +23,7 @@
 
 extern "C"
 {
+#include <stdio.h>
 #include <string.h>
 #include "src/core/wee-hashtable.h"
 #include "src/core/wee-infolist.h"