diff --git a/build/ci.go b/build/ci.go
index 8456ac5ca4..f268981ae4 100644
--- a/build/ci.go
+++ b/build/ci.go
@@ -318,9 +318,14 @@ func doGenerate() {
 	)
 	pathList := []string{filepath.Join(protocPath, "bin"), protocGenGoPath, os.Getenv("PATH")}
 
+	excludes := []string{"tests/testdata", "build/cache", ".git"}
+	for i := range excludes {
+		excludes[i] = filepath.FromSlash(excludes[i])
+	}
+
 	for _, mod := range goModules {
 		// Compute the origin hashes of all the files
-		hashes, err := build.HashFolder(mod, []string{"tests/testdata", "build/cache", ".git"})
+		hashes, err := build.HashFolder(mod, excludes)
 		if err != nil {
 			log.Fatal("Error computing hashes", "err", err)
 		}
@@ -330,7 +335,7 @@ func doGenerate() {
 		c.Dir = mod
 		build.MustRun(c)
 		// Check if generate file hashes have changed
-		generated, err := build.HashFolder(mod, []string{"tests/testdata", "build/cache", ".git"})
+		generated, err := build.HashFolder(mod, excludes)
 		if err != nil {
 			log.Fatalf("Error re-computing hashes: %v", err)
 		}
diff --git a/internal/build/file.go b/internal/build/file.go
index a6f6709e8a..3938111b62 100644
--- a/internal/build/file.go
+++ b/internal/build/file.go
@@ -22,19 +22,19 @@ import (
 	"os"
 	"path/filepath"
 	"slices"
-	"strings"
 )
 
 // HashFolder iterates all files under the given directory, computing the hash
 // of each.
-func HashFolder(folder string, exlude []string) (map[string][32]byte, error) {
+func HashFolder(folder string, excludes []string) (map[string][32]byte, error) {
 	res := make(map[string][32]byte)
 	err := filepath.WalkDir(folder, func(path string, d os.DirEntry, _ error) error {
-		// Skip anything that's exluded or not a regular file
-		for _, skip := range exlude {
-			if strings.HasPrefix(path, filepath.FromSlash(skip)) {
+		// Skip anything that's excluded or not a regular file
+		if slices.Contains(excludes, path) {
+			if d.IsDir() {
 				return filepath.SkipDir
 			}
+			return nil
 		}
 		if !d.Type().IsRegular() {
 			return nil