diff --git a/build/build/src/enso.rs b/build/build/src/enso.rs
index 14f5bced3e6b..33b1708c2364 100644
--- a/build/build/src/enso.rs
+++ b/build/build/src/enso.rs
@@ -266,8 +266,13 @@ impl BuiltEnso {
         if errors.is_empty() {
             Ok(())
         } else {
-            let summary =
-                errors.as_slice().iter().map(|e| e.to_string()).collect::<Vec<_>>().join(", ");
+            let summary = errors
+                .as_slice()
+                .iter()
+                .map(|e| e.to_string())
+                .collect::<Vec<_>>()
+                .join(";\n")
+                .replace("\n", "%0A");
             println!(
                 "::error title=Failed Standard Library Tests::{} test suite(s) failed: {}",
                 errors.len(),