diff --git a/.gitattributes b/.gitattributes
new file mode 100644
index 00000000..96d94205
--- /dev/null
+++ b/.gitattributes
@@ -0,0 +1,2 @@
+*.cabal linguist-generated
+/examples/init/foo.cabal -linguist-generated
diff --git a/cabal.project b/cabal.project
index f251078a..9754c17e 100644
--- a/cabal.project
+++ b/cabal.project
@@ -1 +1,2 @@
 packages: garn.cabal
+tests: True
diff --git a/src/Garn.hs b/src/Garn.hs
index 8e9dc61f..4e506dd5 100644
--- a/src/Garn.hs
+++ b/src/Garn.hs
@@ -6,7 +6,7 @@ module Garn
   )
 where
 
-import Control.Exception (catch)
+import Control.Exception (catch, throwIO)
 import Control.Monad (forM_, when)
 import Development.Shake (Exit (Exit), cmd)
 import Garn.Common (currentSystem, nixArgs)
@@ -48,7 +48,7 @@ runWith env (WithGarnTsOpts garnConfig opts) = do
   case opts of
     Gen -> pure ()
     Run (CommandOptions {..}) argv -> do
-      callProcess "nix" $ ["run"] <> nixArgs <> [".#" <> asNixFacing target, "--"] <> argv
+      rawSystem "nix" (["run"] <> nixArgs <> [".#" <> asNixFacing target, "--"] <> argv) >>= throwIO
     Enter (CommandOptions {..}) -> do
       hPutStrLn stderr $
         "[garn] Entering "
diff --git a/test/spec/RunSpec.hs b/test/spec/RunSpec.hs
index 2b2d1b40..8ef2dfbe 100644
--- a/test/spec/RunSpec.hs
+++ b/test/spec/RunSpec.hs
@@ -45,6 +45,19 @@ spec =
           output <- runGarn ["run", "main"] "" repoDir Nothing
           stdout output `shouldBe` "foobarbaz\n"
           exitCode output `shouldBe` ExitSuccess
+
+        it "propagates the exit status of the child process" $ do
+          writeFile
+            "garn.ts"
+            [i|
+              import * as garn from "#{repoDir}/ts/mod.ts"
+
+              export const main = garn.shell`exit 23`;
+            |]
+          output <- runGarn ["run", "main"] "" repoDir Nothing
+          stdout output `shouldBe` ""
+          exitCode output `shouldBe` ExitFailure 23
+
         it "runs executables within an environment" $ do
           writeFile
             "garn.ts"