diff --git a/builder/dockerfile/copy_test.go b/builder/dockerfile/copy_test.go
index 5fce0bd4eb..e837ce07ad 100644
--- a/builder/dockerfile/copy_test.go
+++ b/builder/dockerfile/copy_test.go
@@ -53,31 +53,31 @@ func TestGetFilenameForDownload(t *testing.T) {
 		expected    string
 	}{
 		{
-			path:     "http://www.example.com/",
+			path:     "https://www.example.com/",
 			expected: "",
 		},
 		{
-			path:     "http://www.example.com/xyz",
+			path:     "https://www.example.com/xyz",
 			expected: "xyz",
 		},
 		{
-			path:     "http://www.example.com/xyz.html",
+			path:     "https://www.example.com/xyz.html",
 			expected: "xyz.html",
 		},
 		{
-			path:     "http://www.example.com/xyz/",
+			path:     "https://www.example.com/xyz/",
 			expected: "",
 		},
 		{
-			path:     "http://www.example.com/xyz/uvw",
+			path:     "https://www.example.com/xyz/uvw",
 			expected: "uvw",
 		},
 		{
-			path:     "http://www.example.com/xyz/uvw.html",
+			path:     "https://www.example.com/xyz/uvw.html",
 			expected: "uvw.html",
 		},
 		{
-			path:     "http://www.example.com/xyz/uvw/",
+			path:     "https://www.example.com/xyz/uvw/",
 			expected: "",
 		},
 		{
@@ -114,23 +114,23 @@ func TestGetFilenameForDownload(t *testing.T) {
 			expected:    "xyz.html",
 		},
 		{
-			disposition: "attachment; filename=\"xyz\"",
+			disposition: `attachment; filename="xyz"`,
 			expected:    "xyz",
 		},
 		{
-			disposition: "attachment; filename=\"xyz.html\"",
+			disposition: `attachment; filename="xyz.html"`,
 			expected:    "xyz.html",
 		},
 		{
-			disposition: "attachment; filename=\"/xyz.html\"",
+			disposition: `attachment; filename="/xyz.html"`,
 			expected:    "xyz.html",
 		},
 		{
-			disposition: "attachment; filename=\"/xyz/uvw\"",
+			disposition: `attachment; filename="/xyz/uvw"`,
 			expected:    "uvw",
 		},
 		{
-			disposition: "attachment; filename=\"Naïve file.txt\"",
+			disposition: `attachment; filename="Naïve file.txt"`,
 			expected:    "Naïve file.txt",
 		},
 	}
diff --git a/builder/dockerfile/copy_windows.go b/builder/dockerfile/copy_windows.go
index 1a3a488516..bca088da6e 100644
--- a/builder/dockerfile/copy_windows.go
+++ b/builder/dockerfile/copy_windows.go
@@ -15,8 +15,8 @@ import (
 )
 
 var pathDenyList = map[string]bool{
-	"c:\\":        true,
-	"c:\\windows": true,
+	`c:\`:        true,
+	`c:\windows`: true,
 }
 
 func init() {