diff --git a/gammu.spec b/gammu.spec
index f1ba39e..96555b3 100644
--- a/gammu.spec
+++ b/gammu.spec
@@ -124,7 +124,8 @@ install -pm 0644 docs/config/smsdrc %{buildroot}%{_sysconfdir}/gammu-smsdrc
 
 %check
 pushd build
-ctest -V  %{?_smp_mflags}
+# add %%{?_smp_mflags} breaks the tests
+ctest -V
 popd
 
 %post