diff --git a/.travis.yml b/.travis.yml
index c282606..ecfe94e 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -27,5 +27,5 @@ install:
   - nuget install NUnit.Runners -Version 3.0.1 -OutputDirectory testrunner
 
 script:
-  - xbuild /p:Configuration=Release ./src/TweetNaCl.sln
+  - xbuild /p:Configuration=Debug ./src/TweetNaCl.sln
   - mono ./testrunner/NUnit.Console.3.0.1/tools/nunit3-console.exe src/TweetNaCl.Tests/bin/Release/TweetNaCl.Tests.dll
diff --git a/build.fsx b/build.fsx
index 896ae47..e6e7aa3 100644
--- a/build.fsx
+++ b/build.fsx
@@ -16,12 +16,14 @@ Target "Clean" (fun _ ->
 
 Target "BuildLibDebug" (fun _ ->
     !! "src/**/*.csproj"
-    |> MSBuildRelease buildDir "Build"
+    -- "src/**/*.Bench.csproj"
+    |> MSBuildDebug buildDir "Build"
     |> Log "AppBuild-Output: "
 )
 
 Target "BuildLibRelease" (fun _ ->
     !! "src/**/*.csproj"
+    -- "src/**/*.Bench.csproj"
     |> MSBuildRelease deployDir "Build"
     |> Log "AppBuild-Output: "
 )