1 files changed, 4 insertions, 1 deletions
diff --git a/src/VeriFuzz/Sim/Yosys.hs b/src/VeriFuzz/Sim/Yosys.hs
index 3e1754a..17f52df 100644
--- a/src/VeriFuzz/Sim/Yosys.hs
+++ b/src/VeriFuzz/Sim/Yosys.hs
@@ -32,7 +32,7 @@ import           VeriFuzz.Verilog.CodeGen
 import           VeriFuzz.Verilog.Mutate
 
 newtype Yosys = Yosys { yosysPath :: FilePath }
-              deriving (Eq, Show)
+              deriving (Eq)
 
 instance Tool Yosys where
   toText _ = "yosys"
@@ -40,6 +40,9 @@ instance Tool Yosys where
 instance Synthesiser Yosys where
   runSynth = runSynthYosys
 
+instance Show Yosys where
+    show _ = "yosys"
+
 defaultYosys :: Yosys
 defaultYosys = Yosys "yosys"