diff --git a/runner/v1/runner.proto b/runner/v1/runner.proto
index 0e8e206..9faa805 100644
--- a/runner/v1/runner.proto
+++ b/runner/v1/runner.proto
@@ -23,12 +23,15 @@ message Build {
   int32 solution_id = 1; // FIXME: make private
   string binding_key = 2;
   int32 language = 3;
-  string solution = 4;
+  //string solution = 4;
+  string solution_uri = 5;
+  string executable_uri = 6;
 }
 
 message BuildResult {
   int32 solution_id = 1; // FIXME: make private
   int32 status = 2;
+  string error = 3;
 }
 
 message Run {