diff --git a/example_test.go b/example_test.go
index ac1b3f8e..d23c9476 100644
--- a/example_test.go
+++ b/example_test.go
@@ -53,7 +53,7 @@ func ExampleBlockChain_ProcessBlock() {
 		fmt.Printf("Failed to process block: %v\n", err)
 		return
 	}
-	fmt.Println("Block accepted.  Is it an orphan?: %v", isOrphan)
+	fmt.Printf("Block accepted. Is it an orphan?: %v", isOrphan)
 
 	// Output:
 	// Failed to process block: already have block 000000000019d6689c085ae165831e934ff763ae46a2a6c172b3f1b60a8ce26f