diff --git a/testProcess.c b/testProcess.c
index 32ee821caa2fad8fc04163eb686ed34630cd12ee..6b94e8f0dc953bbf3f396ad6438dce71c7934367 100644
--- a/testProcess.c
+++ b/testProcess.c
@@ -14,6 +14,7 @@
 #include <kwsys/Process.h>
 #include <stdio.h>
 #include <stdlib.h>
+#include <string.h>
 
 #if defined(_WIN32)
 # include <windows.h>