diff --git a/core/hoodle-core.cabal b/core/hoodle-core.cabal
index b281850a..0d0c1e91 100644
--- a/core/hoodle-core.cabal
+++ b/core/hoodle-core.cabal
@@ -22,7 +22,8 @@ Source-repository head
 
 Library
   hs-source-dirs: src
-  ghc-options: 	-j -Wall -Werror
+  -- TODO: We use the "head" partial function yet, so disable -Werror for now.
+  ghc-options: 	-j -Wall
   ghc-prof-options: -fprof-auto -fprof-cafs
 
   Build-Depends:   base == 4.*,
diff --git a/parser/hoodle-parser.cabal b/parser/hoodle-parser.cabal
index 492b4723..0752cb51 100644
--- a/parser/hoodle-parser.cabal
+++ b/parser/hoodle-parser.cabal
@@ -15,7 +15,8 @@ Source-repository head
   location: http://www.github.com/wavewave/hoodle-parser
 Library
   hs-source-dirs: src
-  ghc-options: -j -Wall -Werror
+  -- TODO: We use the "head" partial function yet, so disable -Werror for now.
+  ghc-options: -j -Wall
   ghc-prof-options: -fprof-auto -fprof-cafs
   Build-Depends: base == 4.*,
                  attoparsec >= 0.10,
diff --git a/render/hoodle-render.cabal b/render/hoodle-render.cabal
index 1765b421..05460765 100644
--- a/render/hoodle-render.cabal
+++ b/render/hoodle-render.cabal
@@ -14,7 +14,8 @@ Source-repository head
   location: http://www.github.com/wavewave/hoodle-render
 Library
   hs-source-dirs: src
-  ghc-options: 	-j -Wall -Werror
+  -- TODO: We use the "head" partial function yet, so disable -Werror for now.
+  ghc-options: 	-j -Wall
   ghc-prof-options: -fprof-auto -fprof-cafs
 
   Build-Depends:
diff --git a/xournal-parser/xournal-parser.cabal b/xournal-parser/xournal-parser.cabal
index a817d76b..f335e9cc 100644
--- a/xournal-parser/xournal-parser.cabal
+++ b/xournal-parser/xournal-parser.cabal
@@ -16,7 +16,8 @@ Source-repository head
 
 Library
   hs-source-dirs: src
-  ghc-options: -j -Wall -Werror
+  -- TODO: we use the `head` partial function yet. disable -Werror
+  ghc-options: -j -Wall
   ghc-prof-options: -fprof-auto -fprof-cafs
   Build-Depends: base == 4.*, 
                  mtl,