diff --git a/lib/Echidna/Processor.hs b/lib/Echidna/Processor.hs
index f57d3bc1c..5eae27c56 100644
--- a/lib/Echidna/Processor.hs
+++ b/lib/Echidna/Processor.hs
@@ -37,7 +37,7 @@ data ProcException = ProcessorFailure String String
 instance Show ProcException where
   show = \case
     ProcessorFailure p e -> "Error running " ++ p ++ ":\n" ++ e
-    ProcessorNotFound p e -> "Cannot find " ++ p ++ "in PATH.\n" ++ e
+    ProcessorNotFound p e -> "Cannot find " ++ p ++ " in PATH.\n" ++ e
 
 instance Exception ProcException