diff --git a/Test/Framework/TH/Prime/Parser.hs b/Test/Framework/TH/Prime/Parser.hs
--- a/Test/Framework/TH/Prime/Parser.hs
+++ b/Test/Framework/TH/Prime/Parser.hs
@@ -58,7 +58,11 @@
   where
     pack = unlines . tail . map snd
     go = cppIfdef "dummy" [] [] defaultBoolOptions
-    opt = defaultParseMode {extensions = [TemplateHaskell]}
+    opt = defaultParseMode {
+        extensions = [TemplateHaskell]
+      -- to prevent "Ambiguous infix expression"
+      , fixities = Nothing
+      }
 
 ----------------------------------------------------------------
 
diff --git a/test-framework-th-prime.cabal b/test-framework-th-prime.cabal
--- a/test-framework-th-prime.cabal
+++ b/test-framework-th-prime.cabal
@@ -1,5 +1,5 @@
 Name:                   test-framework-th-prime
-Version:                0.0.3
+Version:                0.0.4
 Author:                 Kazu Yamamoto <kazu@iij.ad.jp>
 Maintainer:             Kazu Yamamoto <kazu@iij.ad.jp>
 License:                BSD3