diff --git a/mnexec.c b/mnexec.c
index ea8fb6f..b7be9bc 100644
--- a/mnexec.c
+++ b/mnexec.c
@@ -63,7 +63,7 @@ void validate(char *path)
 }
 
 /* Add our pid to cgroup */
-int cgroup(char *gname)
+void cgroup(char *gname)
 {
     static char path[PATH_MAX];
     static char *groups[] = {