diff --git a/ChangeLog.md b/ChangeLog.md
--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -1,3 +1,7 @@
+## 0.4.12
+
+* Added `IsString RequestBody` instance [#126](https://github.com/snoyberg/http-client/pull/126)
+
 ## 0.4.11.3
 
 * Fix getUri to insert "?" to uriQuery when necessary. [#123](https://github.com/snoyberg/http-client/pull/123)
diff --git a/Network/HTTP/Client/Types.hs b/Network/HTTP/Client/Types.hs
--- a/Network/HTTP/Client/Types.hs
+++ b/Network/HTTP/Client/Types.hs
@@ -42,6 +42,7 @@
 import Data.Default.Class
 import Data.Foldable (Foldable)
 import Data.Monoid
+import Data.String (IsString, fromString)
 import Data.Time (UTCTime)
 import Data.Traversable (Traversable)
 import qualified Data.List as DL
@@ -207,6 +208,11 @@
     | RequestBodyStream Int64 (GivesPopper ())
     | RequestBodyStreamChunked (GivesPopper ())
     deriving T.Typeable
+-- |
+--
+-- Since 0.4.12
+instance IsString RequestBody where
+    fromString str = RequestBodyBS (fromString str)
 instance Monoid RequestBody where
     mempty = RequestBodyBS S.empty
     mappend x0 y0 =
diff --git a/http-client.cabal b/http-client.cabal
--- a/http-client.cabal
+++ b/http-client.cabal
@@ -1,5 +1,5 @@
 name:                http-client
-version:             0.4.11.3
+version:             0.4.12
 synopsis:            An HTTP client engine, intended as a base layer for more user-friendly packages.
 description:         Hackage documentation generation is not reliable. For up to date documentation, please see: <http://www.stackage.org/package/http-client>.
 homepage:            https://github.com/snoyberg/http-client