diff --git a/lib/procinfo_mac.cpp b/lib/procinfo_mac.cpp
index a92198973f4925fa1182ce7e70bf6e677df0520c..39f8adee91e8c8dd2297029eaff7b70384320d77 100644
--- a/lib/procinfo_mac.cpp
+++ b/lib/procinfo_mac.cpp
@@ -24,6 +24,7 @@
 #include <sys/types.h>
 #include <dirent.h>
 #include <unistd.h>
+#include <string.h>
 
 #if SHOW_TIMING
 #include <Carbon/Carbon.h>