diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,9 @@
 # Mustache library changelog
 
+## v0.4.0.1rc-5
+
+- Added a necessary OVERLAPPABLE pragma
+
 ## v0.4.0.0rc-4 (current stable version)
 
 - Removed `conversion` and `conversion-text` dependency.
diff --git a/mustache.cabal b/mustache.cabal
--- a/mustache.cabal
+++ b/mustache.cabal
@@ -1,5 +1,5 @@
 name:                mustache
-version:             0.4.0.0
+version:             0.4.0.1
 synopsis:            A mustache template parser library.
 description:
   Allows parsing and rendering template files with mustache markup. See the
@@ -30,7 +30,7 @@
   type:     git
   branch:   master
   location: git://github.com/JustusAdam/mustache.git
-  tag:      v0.4.0.0rc-4
+  tag:      v0.4.0.1rc-5
 
 
 
diff --git a/src/lib/Text/Mustache/Types.hs b/src/lib/Text/Mustache/Types.hs
--- a/src/lib/Text/Mustache/Types.hs
+++ b/src/lib/Text/Mustache/Types.hs
@@ -107,7 +107,7 @@
 instance ToMustache Value where
   toMustache = id
 
-instance ToMustache [Char] where
+instance ToMustache String where
   toMustache = toMustache ∘ pack
 
 instance ToMustache Bool where
@@ -125,7 +125,7 @@
 instance ToMustache Scientific where
   toMustache = Number
 
-instance ToMustache ω ⇒ ToMustache [ω] where
+instance {-# OVERLAPPABLE #-} ToMustache ω ⇒ ToMustache [ω] where
   toMustache = Array ∘ V.fromList ∘ fmap toMustache
 
 instance ToMustache ω ⇒ ToMustache (V.Vector ω) where