diff --git a/sysctl.c b/sysctl.c
index 9be79ce1..57d3e9aa 100644
--- a/sysctl.c
+++ b/sysctl.c
@@ -30,6 +30,7 @@
 #include <dirent.h>
 #include <string.h>
 #include <errno.h>
+#include <libgen.h>
 #include "proc/procps.h"
 #include "proc/version.h"