diff --git a/java_grpc_library.bzl b/java_grpc_library.bzl
index 51e4f6996e..11d6e393e9 100644
--- a/java_grpc_library.bzl
+++ b/java_grpc_library.bzl
@@ -85,7 +85,7 @@ def _java_rpc_library_impl(ctx):
     args = ctx.actions.args()
     args.add(toolchain.plugin, format = "--plugin=protoc-gen-rpc-plugin=%s")
     args.add("--rpc-plugin_out={0}:{1}".format(toolchain.plugin_arg, srcjar.path))
-    args.add_joined("--descriptor_set_in", descriptor_set_in, join_with = ctx.host_configuration.host_path_separator)
+    args.add_joined("--descriptor_set_in", descriptor_set_in, join_with = ctx.configuration.host_path_separator)
     args.add_all(srcs, map_each = _path_ignoring_repository)
 
     ctx.actions.run(