diff --git a/internal/fastwalk/fastwalk.go b/internal/fastwalk/fastwalk.go
index 7219c8e..9887f7e 100644
--- a/internal/fastwalk/fastwalk.go
+++ b/internal/fastwalk/fastwalk.go
@@ -14,14 +14,14 @@
 	"sync"
 )
 
-// TraverseLink is used as a return value from WalkFuncs to indicate that the
+// ErrTraverseLink is used as a return value from WalkFuncs to indicate that the
 // symlink named in the call may be traversed.
-var TraverseLink = errors.New("fastwalk: traverse symlink, assuming target is a directory")
+var ErrTraverseLink = errors.New("fastwalk: traverse symlink, assuming target is a directory")
 
-// SkipFiles is a used as a return value from WalkFuncs to indicate that the
+// ErrSkipFiles is a used as a return value from WalkFuncs to indicate that the
 // callback should not be called for any other files in the current directory.
 // Child directories will still be traversed.
-var SkipFiles = errors.New("fastwalk: skip remaining files in directory")
+var ErrSkipFiles = errors.New("fastwalk: skip remaining files in directory")
 
 // Walk is a faster implementation of filepath.Walk.
 //
@@ -167,7 +167,7 @@
 
 	err := w.fn(joined, typ)
 	if typ == os.ModeSymlink {
-		if err == TraverseLink {
+		if err == ErrTraverseLink {
 			// Set callbackDone so we don't call it twice for both the
 			// symlink-as-symlink and the symlink-as-directory later:
 			w.enqueue(walkItem{dir: joined, callbackDone: true})
diff --git a/internal/fastwalk/fastwalk_portable.go b/internal/fastwalk/fastwalk_portable.go
index a906b87..b0d6327 100644
--- a/internal/fastwalk/fastwalk_portable.go
+++ b/internal/fastwalk/fastwalk_portable.go
@@ -26,7 +26,7 @@
 			continue
 		}
 		if err := fn(dirName, fi.Name(), fi.Mode()&os.ModeType); err != nil {
-			if err == SkipFiles {
+			if err == ErrSkipFiles {
 				skipFiles = true
 				continue
 			}
diff --git a/internal/fastwalk/fastwalk_test.go b/internal/fastwalk/fastwalk_test.go
index a122ddf..a6d9bea 100644
--- a/internal/fastwalk/fastwalk_test.go
+++ b/internal/fastwalk/fastwalk_test.go
@@ -184,7 +184,7 @@
 				mu.Lock()
 				defer mu.Unlock()
 				want["/src/"+filepath.Base(path)] = 0
-				return fastwalk.SkipFiles
+				return fastwalk.ErrSkipFiles
 			}
 			return nil
 		},
@@ -208,7 +208,7 @@
 	},
 		func(path string, typ os.FileMode) error {
 			if typ == os.ModeSymlink {
-				return fastwalk.TraverseLink
+				return fastwalk.ErrTraverseLink
 			}
 			return nil
 		},
diff --git a/internal/fastwalk/fastwalk_unix.go b/internal/fastwalk/fastwalk_unix.go
index 3369b1a..ce38fdc 100644
--- a/internal/fastwalk/fastwalk_unix.go
+++ b/internal/fastwalk/fastwalk_unix.go
@@ -66,7 +66,7 @@
 			continue
 		}
 		if err := fn(dirName, name, typ); err != nil {
-			if err == SkipFiles {
+			if err == ErrSkipFiles {
 				skipFiles = true
 				continue
 			}