diff --git a/builtin/worktree.c b/builtin/worktree.c
index 6d7da11746..9c76b62b02 100644
--- a/builtin/worktree.c
+++ b/builtin/worktree.c
@@ -848,21 +848,21 @@ static int add(int ac, const char **av, const char *prefix)
 		const char *s = worktree_basename(path, &n);
 		new_branch = xstrndup(s, n);
 	} else if (opts.orphan) {
-		// No-op
+		; /* no-op */
 	} else if (opts.detach) {
-		// Check HEAD
+		/* Check HEAD */
 		if (!strcmp(branch, "HEAD"))
 			can_use_local_refs(&opts);
 	} else if (ac < 2 && new_branch) {
-		// DWIM: Infer --orphan when repo has no refs.
+		/* DWIM: Infer --orphan when repo has no refs. */
 		opts.orphan = dwim_orphan(&opts, !!opt_track, 0);
 	} else if (ac < 2) {
-		// DWIM: Guess branch name from path.
+		/* DWIM: Guess branch name from path. */
 		const char *s = dwim_branch(path, &new_branch);
 		if (s)
 			branch = s;
 
-		// DWIM: Infer --orphan when repo has no refs.
+		/* DWIM: Infer --orphan when repo has no refs. */
 		opts.orphan = (!s) && dwim_orphan(&opts, !!opt_track, 1);
 	} else if (ac == 2) {
 		struct object_id oid;
diff --git a/merge-ort.c b/merge-ort.c
index d72fd04f58..8617babee4 100644
--- a/merge-ort.c
+++ b/merge-ort.c
@@ -2642,7 +2642,7 @@ static void apply_directory_rename_modifications(struct merge_options *opt,
 			oidcpy(&ci->stages[i].oid, null_oid());
 		}
 
-		// Now we want to focus on new_ci, so reassign ci to it
+		/* Now we want to focus on new_ci, so reassign ci to it. */
 		ci = new_ci;
 	}
 
diff --git a/reftable/pq_test.c b/reftable/pq_test.c
index 011b5c7502..c202eff848 100644
--- a/reftable/pq_test.c
+++ b/reftable/pq_test.c
@@ -60,7 +60,7 @@ static void test_pq(void)
 		if (last) {
 			EXPECT(strcmp(last, rec->u.ref.refname) < 0);
 		}
-		// this is names[i], so don't dealloc.
+		/* this is names[i], so don't dealloc. */
 		last = rec->u.ref.refname;
 		rec->u.ref.refname = NULL;
 		reftable_record_release(rec);