diff --git a/man2/ioctl_ns.2 b/man2/ioctl_ns.2
index 818dde32c..8b8789d1f 100644
--- a/man2/ioctl_ns.2
+++ b/man2/ioctl_ns.2
@@ -317,7 +317,8 @@ main(int argc, char *argv[])
         }
         printf("Device/Inode of owning user namespace is: "
                 "[%lx,%lx] / %ld\en",
-                (long) major(sb.st_dev), (long) minor(sb.st_dev),
+                (unsigned long) major(sb.st_dev),
+                (unsigned long) minor(sb.st_dev),
                 (long) sb.st_ino);
 
         close(userns_fd);
@@ -346,7 +347,8 @@ main(int argc, char *argv[])
             exit(EXIT_FAILURE);
         }
         printf("Device/Inode of parent namespace is: [%lx,%lx] / %ld\en",
-                (long) major(sb.st_dev), (long) minor(sb.st_dev),
+                (unsigned long) major(sb.st_dev),
+                (unsigned long) minor(sb.st_dev),
                 (long) sb.st_ino);
 
         close(parent_fd);