diff --git a/Makefile b/Makefile
index 5cb0fa3177..857ee77183 100644
--- a/Makefile
+++ b/Makefile
@@ -19,7 +19,7 @@ fast: dist/caballog
 	@ln -sf dist/build/git-annex/git-annex git-annex
 
 dist/caballog:
-	cabal configure -f"-Production Fast"
+	cabal configure -f"-Production" -O0
 	cabal build -v2 | tee $@
 
 Build/SysConfig.hs: configure.hs Build/TestConfig.hs Build/Configure.hs
diff --git a/git-annex.cabal b/git-annex.cabal
index 6ba9825a75..c1135464e7 100644
--- a/git-annex.cabal
+++ b/git-annex.cabal
@@ -55,10 +55,6 @@ Flag DNS
 Flag Production
   Description: Enable production build (slower build; faster binary)
 
-Flag Fast
-  Description: Faster build; slower binary
-  Default: False
-
 Flag Android
   Description: Building for Android
   Default: False