diff --git a/tools/ps2test/main.cpp b/tools/ps2test/main.cpp
index 5e58558..6eb0f25 100755
--- a/tools/ps2test/main.cpp
+++ b/tools/ps2test/main.cpp
@@ -1,5 +1,6 @@
 #include <cstdio>
 #include <cassert>
+#include <cerrno>
 
 #define PAL