diff --git a/qt5-qtserialport.spec b/qt5-qtserialport.spec
index 90d1970..33ecc23 100644
--- a/qt5-qtserialport.spec
+++ b/qt5-qtserialport.spec
@@ -65,6 +65,9 @@ pushd %{_target_platform}
 make %{?_smp_mflags}
 
 %if 0%{?docs}
+# HACK to avoid multilib conflicts in noarch content
+# see also https://bugreports.qt-project.org/browse/QTBUG-42071
+QT_HASH_SEED=0; export QT_HASH_SEED
 make %{?_smp_mflags} docs
 %endif
 popd