diff --git a/pkgs/build-support/dotnet/build-dotnet-module/default.nix b/pkgs/build-support/dotnet/build-dotnet-module/default.nix
index 9dd36b03fc48..4bb9432b1cb3 100644
--- a/pkgs/build-support/dotnet/build-dotnet-module/default.nix
+++ b/pkgs/build-support/dotnet/build-dotnet-module/default.nix
@@ -227,8 +227,8 @@ stdenvNoCC.mkDerivation (args // {
         else
           ''$(mktemp -t "${pname}-deps-XXXXXX.nix")'';
       storeSrc = srcOnly args;
-      projectFileStr = lib.escapeShellArg projectFiles;
-      testProjectFileStr = lib.escapeShellArg testProjectFiles;
+      projectFileStr = lib.escapeShellArgs projectFiles;
+      testProjectFileStr = lib.escapeShellArgs testProjectFiles;
       path = lib.makeBinPath [
         coreutils
         runtimeShellPackage