diff --git a/internal/types/blacklist.go b/internal/types/blacklist.go
index 4606c5e..79657ac 100644
--- a/internal/types/blacklist.go
+++ b/internal/types/blacklist.go
@@ -55,5 +55,5 @@ func (bl Blacklist) IsAllowed(contract string, action string) bool {
 }
 
 func (bl Blacklist) IsDenied(contract string, action string) bool {
-	return bl.IsAllowed(contract, action)
+	return !bl.IsAllowed(contract, action)
 }
diff --git a/internal/types/blacklist_test.go b/internal/types/blacklist_test.go
index 3c6a8a8..69b987b 100644
--- a/internal/types/blacklist_test.go
+++ b/internal/types/blacklist_test.go
@@ -93,3 +93,19 @@ func TestBlacklist_Whitelist(t *testing.T) {
 	require.False(t, bl.IsAllowed("mycontract", "xxx"))
 	require.False(t, bl.IsAllowed("xxx", "yyy"))
 }
+
+func TestBlacklist_IsDenied(t *testing.T) {
+	bl := Blacklist{
+		table: map[string][]string{
+			"mycontract": {"myaction", "noop"},
+		},
+	}
+
+	require.True(t, bl.IsDenied("mycontract", "myaction"))
+	require.False(t, bl.IsDenied("mycontract", "randomaction"))
+
+	bl.SetWhitelist(true)
+
+	require.False(t, bl.IsDenied("mycontract", "myaction"))
+	require.True(t, bl.IsDenied("mycontract", "randomaction"))
+}