diff --git a/packages/ngtools/webpack/src/transformers/ast_helpers.ts b/packages/ngtools/webpack/src/transformers/ast_helpers.ts
index 83c4bfdbaf..7315693b07 100644
--- a/packages/ngtools/webpack/src/transformers/ast_helpers.ts
+++ b/packages/ngtools/webpack/src/transformers/ast_helpers.ts
@@ -91,7 +91,7 @@ export function transformTypescript(
 
   // Log diagnostics if emit wasn't successfull.
   if (emitSkipped) {
-    console.log(diagnostics);
+    console.error(diagnostics);
 
     return null;
   }
diff --git a/packages/ngtools/webpack/src/type_checker.ts b/packages/ngtools/webpack/src/type_checker.ts
index 0eeff80ccb..688f6c68b1 100644
--- a/packages/ngtools/webpack/src/type_checker.ts
+++ b/packages/ngtools/webpack/src/type_checker.ts
@@ -128,7 +128,7 @@ export class TypeChecker {
 
       if (warnings.length > 0) {
         const message = formatDiagnostics(warnings);
-        console.log(terminal.bold(terminal.yellow('WARNING in ' + message)));
+        console.error(terminal.bold(terminal.yellow('WARNING in ' + message)));
       }
     }
   }