diff --git a/tests/difficulty_test.go b/tests/difficulty_test.go
index 4bdad0ea5d..e80cd248bc 100644
--- a/tests/difficulty_test.go
+++ b/tests/difficulty_test.go
@@ -55,8 +55,8 @@ func TestDifficulty(t *testing.T) {
 	dt.skipLoad("difficultyMorden\\.json")
 	dt.skipLoad("difficultyOlimpic\\.json")
 
-	dt.config("Ropsten", *params.TestnetChainConfig)
-	dt.config("Morden", *params.TestnetChainConfig)
+	dt.config("Ropsten", *params.RopstenChainConfig)
+	dt.config("Morden", *params.RopstenChainConfig)
 	dt.config("Frontier", params.ChainConfig{})
 
 	dt.config("Homestead", params.ChainConfig{
@@ -67,7 +67,7 @@ func TestDifficulty(t *testing.T) {
 		ByzantiumBlock: big.NewInt(0),
 	})
 
-	dt.config("Frontier", *params.TestnetChainConfig)
+	dt.config("Frontier", *params.RopstenChainConfig)
 	dt.config("MainNetwork", mainnetChainConfig)
 	dt.config("CustomMainNetwork", mainnetChainConfig)
 	dt.config("Constantinople", params.ChainConfig{