diff --git a/pyproject-rpm-macros.spec b/pyproject-rpm-macros.spec
index ed98183..f21f481 100644
--- a/pyproject-rpm-macros.spec
+++ b/pyproject-rpm-macros.spec
@@ -6,7 +6,7 @@ License:        MIT
 
 # Keep the version at zero and increment only release
 Version:        0
-Release:        7%{?dist}
+Release:        8%{?dist}
 
 Source0:        macros.pyproject
 Source1:        pyproject_buildrequires.py
@@ -87,6 +87,9 @@ install -m 644 pyproject_buildrequires.py %{buildroot}%{_rpmconfigdir}/redhat/
 %license LICENSE
 
 %changelog
+* Fri Oct 25 2019 Miro Hrončok <mhroncok@redhat.com> - 0-8
+- When tox fails, print tox output before failing
+
 * Tue Oct 08 2019 Miro Hrončok <mhroncok@redhat.com> - 0-7
 - Move a verbose line of %%pyproject_buildrequires from stdout to stderr
 
diff --git a/pyproject_buildrequires.py b/pyproject_buildrequires.py
index cbe5be9..e11c3d8 100644
--- a/pyproject_buildrequires.py
+++ b/pyproject_buildrequires.py
@@ -183,13 +183,14 @@ def generate_tox_requirements(toxenv, requirements):
     with tempfile.NamedTemporaryFile('r') as depfile:
         r = subprocess.run(
             ['tox', '--print-deps-to-file', depfile.name, '-qre', toxenv],
-            check=True,
+            check=False,
             encoding='utf-8',
             stdout=subprocess.PIPE,
             stderr=subprocess.STDOUT,
         )
         if r.stdout:
-            print_err(r.stdout)
+            print_err(r.stdout, end='')
+        r.check_returncode()
         requirements.extend(depfile.read().splitlines(),
                             source=f'tox --print-deps-only: {toxenv}')