diff --git a/src/embed/embed.go b/src/embed/embed.go
index 4d5e418c9024b3..5b99c5e69a6526 100644
--- a/src/embed/embed.go
+++ b/src/embed/embed.go
@@ -359,12 +359,14 @@ func (f *openFile) Read(b []byte) (int, error) {
 
 func (f *openFile) Seek(offset int64, whence int) (int64, error) {
 	switch whence {
-	case 0:
+	case io.SeekStart:
 		// offset += 0
-	case 1:
+	case io.SeekCurrent:
 		offset += f.offset
-	case 2:
+	case io.SeekEnd:
 		offset += int64(len(f.f.data))
+	default:
+		return 0, &fs.PathError{Op: "seek", Path: f.f.name, Err: fs.ErrInvalid}
 	}
 	if offset < 0 || offset > int64(len(f.f.data)) {
 		return 0, &fs.PathError{Op: "seek", Path: f.f.name, Err: fs.ErrInvalid}
diff --git a/src/embed/internal/embedtest/embed_test.go b/src/embed/internal/embedtest/embed_test.go
index 875265556f0940..3c69cce21f9059 100644
--- a/src/embed/internal/embedtest/embed_test.go
+++ b/src/embed/internal/embedtest/embed_test.go
@@ -6,7 +6,9 @@ package embedtest
 
 import (
 	"embed"
+	"errors"
 	"io"
+	"io/fs"
 	"reflect"
 	"slices"
 	"testing"
@@ -220,6 +222,15 @@ func TestOffset(t *testing.T) {
 		t.Fatal("Seek:", off)
 	}
 
+	// Use Seek with an invalid whence.
+	_, err = seeker.Seek(0, io.SeekEnd+5)
+	if err == nil {
+		t.Fatal("Seek: expected error for invalid whence")
+	}
+	if !errors.Is(err, fs.ErrInvalid) {
+		t.Fatalf("Seek: expected fs.ErrInvalid, got %v", err)
+	}
+
 	// Use ReadAt to read the entire file, ignoring the offset.
 	at := file.(io.ReaderAt)
 	got = make([]byte, len(want))