diff --git a/.github/workflows/CI.yml b/.github/workflows/CI.yml
index 365bbcc1..5ef798df 100644
--- a/.github/workflows/CI.yml
+++ b/.github/workflows/CI.yml
@@ -136,7 +136,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-24.04, macos-14]
-        golang-version: ['1.21', '1.22', '1.23']
+        golang-version: ['1.23']
     steps:
       - name: Set up Golang ${{ matrix.golang-version }}
         uses: actions/setup-go@v5
diff --git a/private_set_intersection/cpp/datastructure/golomb.h b/private_set_intersection/cpp/datastructure/golomb.h
index 15998e7f..77480851 100644
--- a/private_set_intersection/cpp/datastructure/golomb.h
+++ b/private_set_intersection/cpp/datastructure/golomb.h
@@ -38,7 +38,7 @@ __forceinline static int bsf(unsigned int x) {
 #define CTZ(x) __builtin_ctz(x)
 #endif
 
-#define DIV_CEIL(a, b) (((a) + (b)-1) / (b))
+#define DIV_CEIL(a, b) (((a) + (b) - 1) / (b))
 
 struct GolombCompressed {
   int64_t div;