diff --git a/tools/tests/model.py b/tools/tests/model.py
index cd9ed1f01f..95298ff21b 100644
--- a/tools/tests/model.py
+++ b/tools/tests/model.py
@@ -109,6 +109,7 @@ def build_model(self, compiler='gnu', build='REPRO', memory_type='dynamic'):
             output = sp.check_output(command, stderr=sp.STDOUT, shell=True)
         except sp.CalledProcessError as e:
             ret = e.returncode
+            output = e.output
             print(e.output, file=sys.stderr)
         finally:
             os.chdir(saved_path)