diff --git a/mnexec.c b/mnexec.c
index b1b2745..a563499 100644
--- a/mnexec.c
+++ b/mnexec.c
@@ -92,7 +92,7 @@ int cgroup(char *gname)
 
 int main(int argc, char *argv[])
 {
-    char c;
+    int c;
     int fd;
     char path[PATH_MAX];
     int nsid;