diff --git a/csharp/build_release.sh b/csharp/build_release.sh
index 1c3a9de..8a641b2 100755
--- a/csharp/build_release.sh
+++ b/csharp/build_release.sh
@@ -7,4 +7,5 @@
 set DOTNET_CLI_TELEMETRY_OPTOUT=true
 
 # Builds Google.Protobuf NuGet packages
+dotnet restore -s /lib/csharp/ src/Google.Protobuf/Google.Protobuf.csproj
 dotnet pack --no-restore -c Release src/Google.Protobuf.sln -p:ContinuousIntegrationBuild=true