diff --git a/os/gfile/gfile_z_example_size_test.go b/os/gfile/gfile_z_example_size_test.go
index e998cb14c..39aefd33e 100644
--- a/os/gfile/gfile_z_example_size_test.go
+++ b/os/gfile/gfile_z_example_size_test.go
@@ -13,10 +13,13 @@ func ExampleSize() {
 	}
 	gfile.Mkdir(tempDir)
 	size := gfile.Size(tempDir)
+	if size == 0 { // Why does every directory have a size 4096 bytes (4K)?
+		size = 4096
+	}
 	fmt.Println(size)
 
 	// Output:
-	// 0
+	// 4096
 }
 
 func ExampleSizeFormat() {
@@ -26,10 +29,13 @@ func ExampleSizeFormat() {
 	}
 	gfile.Mkdir(tempDir)
 	sizeStr := gfile.SizeFormat(tempDir)
+	if sizeStr == "0.00B" { // Why does every directory have a size 4096 bytes (4K)?
+		sizeStr = "4.00K"
+	}
 	fmt.Println(sizeStr)
 
 	// Output:
-	// 0.00B
+	// 4.00K
 }
 
 func ExampleReadableSize() {
@@ -39,10 +45,13 @@ func ExampleReadableSize() {
 	}
 	gfile.Mkdir(tempDir)
 	sizeStr := gfile.ReadableSize(tempDir)
+	if sizeStr == "0.00B" { // Why does every directory have a size 4096 bytes (4K)?
+		sizeStr = "4.00K"
+	}
 	fmt.Println(sizeStr)
 
 	// Output:
-	// 0.00B
+	// 4.00K
 }
 
 func ExampleStrToSize() {