diff --git a/tests/Prometheus.Client.Owin.Tests.csproj b/tests/Prometheus.Client.Owin.Tests.csproj
index e827d58..816ce54 100644
--- a/tests/Prometheus.Client.Owin.Tests.csproj
+++ b/tests/Prometheus.Client.Owin.Tests.csproj
@@ -4,7 +4,7 @@
false
-
+
all