diff --git a/src/process_group.c b/src/process_group.c
index 06d73a6..3ca66b0 100644
--- a/src/process_group.c
+++ b/src/process_group.c
@@ -20,6 +20,7 @@
  */
 
 #include <string.h>
+#include <libgen.h>
 #include <stdlib.h>
 #include <limits.h>
 #include <sys/time.h>