diff --git a/simgear/misc/path_test.cxx b/simgear/misc/path_test.cxx
index 0c316682..d4a490c4 100644
--- a/simgear/misc/path_test.cxx
+++ b/simgear/misc/path_test.cxx
@@ -2,6 +2,7 @@
 #include <simgear/compiler.h>
 
 #include <iostream>
+#include <cstdlib>
 
 using std::cout;
 using std::cerr;