diff --git a/test/Main.hs b/test/Main.hs
index dbec67a..8eea411 100644
--- a/test/Main.hs
+++ b/test/Main.hs
@@ -5,12 +5,14 @@ import Test.Hspec
 import System.Process
 
 main = do
-  let sandboxes = [ "test/data", "test/data/check-packageid" ]
+  let sandboxes = [ "test/data", "test/data/check-packageid"
+                  , "test/data/duplicate-pkgver/" ]
       genSandboxCfg dir = withDirectory dir $ \cwd -> do
          system ("sed 's|@CWD@|" ++ cwd ++ "|g' cabal.sandbox.config.in > cabal.sandbox.config")
       pkgDirs =
         [ "test/data/.cabal-sandbox/i386-osx-ghc-7.6.3-packages.conf.d"
-        , "test/data/check-packageid/.cabal-sandbox/i386-osx-ghc-7.6.3-packages.conf.d"]
+        , "test/data/check-packageid/.cabal-sandbox/i386-osx-ghc-7.6.3-packages.conf.d"
+        , "test/data/duplicate-pkgver/.cabal-sandbox/i386-osx-ghc-7.6.3-packages.conf.d"]
       genGhcPkgCache dir = system $ "ghc-pkg recache --force -f" ++ dir
   genSandboxCfg `mapM_` sandboxes
   genGhcPkgCache `mapM_` pkgDirs
diff --git a/test/data/duplicate-pkgver/.cabal-sandbox/i386-osx-ghc-7.6.3-packages.conf.d/template-haskell-1.0-7c59d13f32294d1ef6dc6233c24df961.conf b/test/data/duplicate-pkgver/.cabal-sandbox/i386-osx-ghc-7.6.3-packages.conf.d/template-haskell-1.0-7c59d13f32294d1ef6dc6233c24df961.conf
new file mode 100644
index 0000000..826e7e8
--- /dev/null
+++ b/test/data/duplicate-pkgver/.cabal-sandbox/i386-osx-ghc-7.6.3-packages.conf.d/template-haskell-1.0-7c59d13f32294d1ef6dc6233c24df961.conf
@@ -0,0 +1,4 @@
+name: template-haskell
+version: 1.0
+id: template-haskell-1.0-7c59d13f32294d1ef6dc6233c24df961
+exposed: True
diff --git a/test/data/duplicate-pkgver/.cabal-sandbox/i386-osx-ghc-7.6.3-packages.conf.d/template-haskell-2.8.0.0-14e543bdae2da4d2aeff5386892c9112.conf b/test/data/duplicate-pkgver/.cabal-sandbox/i386-osx-ghc-7.6.3-packages.conf.d/template-haskell-2.8.0.0-14e543bdae2da4d2aeff5386892c9112.conf
new file mode 100644
index 0000000..9b9bbf2
--- /dev/null
+++ b/test/data/duplicate-pkgver/.cabal-sandbox/i386-osx-ghc-7.6.3-packages.conf.d/template-haskell-2.8.0.0-14e543bdae2da4d2aeff5386892c9112.conf
@@ -0,0 +1,4 @@
+name: template-haskell
+version: 2.8.0.0
+id: template-haskell-2.8.0.0-14e543bdae2da4d2aeff5386892c9112
+exposed: True
diff --git a/test/data/duplicate-pkgver/.cabal-sandbox/i386-osx-ghc-7.6.3-packages.conf.d/template-haskell-2.8.0.0-32d4f24abdbb6bf41272b183b2e23e9c.conf b/test/data/duplicate-pkgver/.cabal-sandbox/i386-osx-ghc-7.6.3-packages.conf.d/template-haskell-2.8.0.0-32d4f24abdbb6bf41272b183b2e23e9c.conf
new file mode 100644
index 0000000..e8d6158
--- /dev/null
+++ b/test/data/duplicate-pkgver/.cabal-sandbox/i386-osx-ghc-7.6.3-packages.conf.d/template-haskell-2.8.0.0-32d4f24abdbb6bf41272b183b2e23e9c.conf
@@ -0,0 +1,4 @@
+name: template-haskell
+version: 2.8.0.0
+id: template-haskell-2.8.0.0-32d4f24abdbb6bf41272b183b2e23e9c
+exposed: True
diff --git a/test/data/duplicate-pkgver/cabal.sandbox.config.in b/test/data/duplicate-pkgver/cabal.sandbox.config.in
new file mode 100644
index 0000000..2eae397
--- /dev/null
+++ b/test/data/duplicate-pkgver/cabal.sandbox.config.in
@@ -0,0 +1,25 @@
+-- This is a Cabal package environment file.
+-- THIS FILE IS AUTO-GENERATED. DO NOT EDIT DIRECTLY.
+-- Please create a 'cabal.config' file in the same directory
+-- if you want to change the default settings for this sandbox.
+
+
+local-repo: @CWD@/test/data/duplicate-pkgver/.cabal-sandbox/packages
+logs-dir: @CWD@/test/data/duplicate-pkgver/.cabal-sandbox/logs
+world-file: @CWD@/test/data/duplicate-pkgver/.cabal-sandbox/world
+user-install: False
+package-db: @CWD@/test/data/duplicate-pkgver/.cabal-sandbox/i386-osx-ghc-7.6.3-packages.conf.d
+build-summary: @CWD@/test/data/duplicate-pkgver/.cabal-sandbox/logs/build.log
+
+install-dirs
+  prefix: @CWD@/test/data/duplicate-pkgver/.cabal-sandbox
+  bindir: $prefix/bin
+  libdir: $prefix/lib
+  libsubdir: $arch-$os-$compiler/$pkgid
+  libexecdir: $prefix/libexec
+  datadir: $prefix/share
+  datasubdir: $arch-$os-$compiler/$pkgid
+  docdir: $datadir/doc/$arch-$os-$compiler/$pkgid
+  htmldir: $docdir/html
+  haddockdir: $htmldir
+  sysconfdir: $prefix/etc