diff --git a/test/e2e/suite/plugin/install.go b/test/e2e/suite/plugin/install.go
index fde010296..363801d44 100644
--- a/test/e2e/suite/plugin/install.go
+++ b/test/e2e/suite/plugin/install.go
@@ -14,6 +14,8 @@
 package plugin
 
 import (
+	"path/filepath"
+
 	. "github.com/notaryproject/notation/test/e2e/internal/notation"
 	"github.com/notaryproject/notation/test/e2e/internal/utils"
 	. "github.com/onsi/ginkgo/v2"
@@ -62,28 +64,28 @@ var _ = Describe("notation plugin install", func() {
 
 	It("with zip bomb single file exceeds 256 MiB size limit in zip format", func() {
 		Host(nil, func(notation *utils.ExecOpts, _ *Artifact, vhost *utils.VirtualHost) {
-			notation.ExpectFailure().Exec("plugin", "install", "--file", NotationE2EMaliciousPluginArchivePath+"/large_file_zip.zip", "-v").
+			notation.ExpectFailure().Exec("plugin", "install", "--file", filepath.Join(NotationE2EMaliciousPluginArchivePath, "large_file_zip.zip"), "-v").
 				MatchErrContent("Error: plugin installation failed: total file size reached the 256 MiB size limit\n")
 		})
 	})
 
 	It("with zip bomb single file exceeds 256 MiB size limit in tar.gz format", func() {
 		Host(nil, func(notation *utils.ExecOpts, _ *Artifact, vhost *utils.VirtualHost) {
-			notation.ExpectFailure().Exec("plugin", "install", "--file", NotationE2EMaliciousPluginArchivePath+"/large_file_tarGz.tar.gz", "-v").
+			notation.ExpectFailure().Exec("plugin", "install", "--file", filepath.Join(NotationE2EMaliciousPluginArchivePath, "large_file_tarGz.tar.gz"), "-v").
 				MatchErrContent("Error: plugin installation failed: total file size reached the 256 MiB size limit\n")
 		})
 	})
 
 	It("with zip bomb total file size exceeds 256 MiB size limit", func() {
 		Host(nil, func(notation *utils.ExecOpts, _ *Artifact, vhost *utils.VirtualHost) {
-			notation.ExpectFailure().Exec("plugin", "install", "--file", NotationE2EMaliciousPluginArchivePath+"/zip_bomb.zip", "-v").
+			notation.ExpectFailure().Exec("plugin", "install", "--file", filepath.Join(NotationE2EMaliciousPluginArchivePath, "zip_bomb.zip"), "-v").
 				MatchErrContent("Error: plugin installation failed: total file size reached the 256 MiB size limit\n")
 		})
 	})
 
 	It("with zip slip", func() {
 		Host(nil, func(notation *utils.ExecOpts, _ *Artifact, vhost *utils.VirtualHost) {
-			notation.ExpectFailure().Exec("plugin", "install", "--file", NotationE2EMaliciousPluginArchivePath+"/zip_slip.zip", "-v").
+			notation.ExpectFailure().Exec("plugin", "install", "--file", filepath.Join(NotationE2EMaliciousPluginArchivePath, "zip_slip.zip"), "-v").
 				MatchErrContent("Error: plugin installation failed: file name in zip cannot contain '..', but found \"../../../../../../../../tmp/evil.txt\"\n")
 		})
 	})