diff --git a/internal/pkg/kernel/kernel_test.go b/internal/pkg/kernel/kernel_test.go
index e7bd7e1b..fa1ae959 100644
--- a/internal/pkg/kernel/kernel_test.go
+++ b/internal/pkg/kernel/kernel_test.go
@@ -19,30 +19,29 @@ var kernelBuildTests = []struct {
 }{
 	{"4.3.2.1", "kernel1", "vmlinuz-1.2.3.4.gz", false},
 	{"1.2.3.4", "kernel1", "vmlinuz-1.2.3.4.gz", true},
+	{"1.2+3+4", "kernel1", "vmlinuz-1.2+3+4.gz", true},
 }
 
 func Test_BuildKernel(t *testing.T) {
 	wwlog.SetLogLevel(wwlog.DEBUG)
-	srvDir, err := os.MkdirTemp(os.TempDir(), "ww-test-srv-*")
-	assert.NoError(t, err)
-	defer os.RemoveAll(srvDir)
-	conf := warewulfconf.Get()
-	conf.Paths.WWProvisiondir = srvDir
-	kernelDir, err := os.MkdirTemp(os.TempDir(), "ww-test-kernel-*")
-	assert.NoError(t, err)
-	defer os.RemoveAll(kernelDir)
-	{
-		err = os.MkdirAll(path.Join(kernelDir, "boot"), 0755)
+	for _, tt := range kernelBuildTests {
+		srvDir, err := os.MkdirTemp(os.TempDir(), "ww-test-srv-*")
 		assert.NoError(t, err)
-		err = os.MkdirAll(path.Join(kernelDir, "lib/modules/old-kernel"), 0755)
+		conf := warewulfconf.Get()
+		conf.Paths.WWProvisiondir = srvDir
+		kernelDir, err := os.MkdirTemp(os.TempDir(), "ww-test-kernel-*")
 		assert.NoError(t, err)
-		_, err = os.Create(path.Join(kernelDir, "lib/modules/old-kernel/old-module"))
-		assert.NoError(t, err)
-		err = os.MkdirAll(path.Join(kernelDir, "lib/firmware"), 0755)
-		assert.NoError(t, err)
-		_, err = os.Create(path.Join(kernelDir, "lib/firmware/test-firmware"))
-		assert.NoError(t, err)
-		for _, tt := range kernelBuildTests {
+		{
+			err = os.MkdirAll(path.Join(kernelDir, "boot"), 0755)
+			assert.NoError(t, err)
+			err = os.MkdirAll(path.Join(kernelDir, "lib/modules/old-kernel"), 0755)
+			assert.NoError(t, err)
+			_, err = os.Create(path.Join(kernelDir, "lib/modules/old-kernel/old-module"))
+			assert.NoError(t, err)
+			err = os.MkdirAll(path.Join(kernelDir, "lib/firmware"), 0755)
+			assert.NoError(t, err)
+			_, err = os.Create(path.Join(kernelDir, "lib/firmware/test-firmware"))
+			assert.NoError(t, err)
 			_, err = os.Create(path.Join(kernelDir, "boot", tt.kernelFileName))
 			assert.NoError(t, err)
 			err = os.MkdirAll(path.Join(kernelDir, "lib/modules", tt.kernelVersion, "/nested"), 0755)
@@ -52,8 +51,6 @@ func Test_BuildKernel(t *testing.T) {
 			err = os.Symlink(path.Join(kernelDir, "lib/modules/old-kernel/old-module"), path.Join(kernelDir, "lib/modules", tt.kernelVersion, "symlink-module"))
 			assert.NoError(t, err)
 		}
-	}
-	for _, tt := range kernelBuildTests {
 		t.Run(tt.kernelName, func(t *testing.T) {
 			err = Build(tt.kernelVersion, tt.kernelName, kernelDir)
 			if tt.succeed {
@@ -63,10 +60,16 @@ func Test_BuildKernel(t *testing.T) {
 				assert.FileExists(t, path.Join(srvDir, "kernel", tt.kernelName, "kmods.img"))
 				files, err := util.CpioFiles(path.Join(srvDir, "kernel", tt.kernelName, "kmods.img"))
 				assert.NoError(t, err)
-				assert.ElementsMatch(t, files, []string{"lib/firmware/test-firmware", "lib/modules/1.2.3.4/symlink-module", "lib/modules/1.2.3.4/test-module", "lib/modules/1.2.3.4/nested"})
+				assert.ElementsMatch(t, files, []string{
+					"lib/firmware/test-firmware",
+					"lib/modules/" + tt.kernelVersion + "/symlink-module",
+					"lib/modules/" + tt.kernelVersion + "/test-module",
+					"lib/modules/" + tt.kernelVersion + "/nested"})
 			} else {
 				assert.Error(t, err)
 			}
 		})
+		os.RemoveAll(srvDir)
+		os.RemoveAll(kernelDir)
 	}
 }