diff --git a/tests/unit/plugins/irc/test-irc-protocol.cpp b/tests/unit/plugins/irc/test-irc-protocol.cpp
index 6c90fe2c6..72cfc7d75 100644
--- a/tests/unit/plugins/irc/test-irc-protocol.cpp
+++ b/tests/unit/plugins/irc/test-irc-protocol.cpp
@@ -24,6 +24,7 @@
 extern "C"
 {
 #include <stdio.h>
+#include <string.h>
 #include "src/core/wee-arraylist.h"
 #include "src/core/wee-config-file.h"
 #include "src/core/wee-hashtable.h"