diff --git a/.github/workflows/main.yaml b/.github/workflows/main.yaml
index e8067b4..8edb577 100644
--- a/.github/workflows/main.yaml
+++ b/.github/workflows/main.yaml
@@ -22,7 +22,7 @@ jobs:
         uses: actions/checkout@v4
       - name: coding convention
         run: |
-            sudo apt-get install -q -y clang-format-12
+            sudo apt-get install -q -y clang-format
             .ci/check-newline.sh
             .ci/check-format.sh
         shell: bash
diff --git a/mkfs.c b/mkfs.c
index 01a6e0b..59dd967 100644
--- a/mkfs.c
+++ b/mkfs.c
@@ -26,7 +26,7 @@ _Static_assert(sizeof(struct superblock) == SIMPLEFS_BLOCK_SIZE);
  *
  * Return the result of n / d, rounded up to the nearest integer.
  */
-#define DIV_ROUND_UP(n, d) (((n) + (d) -1) / (d))
+#define DIV_ROUND_UP(n, d) (((n) + (d) - 1) / (d))
 
 static struct superblock *write_superblock(int fd, struct stat *fstats)
 {