diff --git a/libqt5-qtdoc.spec b/libqt5-qtdoc.spec
index 0e48352..a3f5c40 100644
--- a/libqt5-qtdoc.spec
+++ b/libqt5-qtdoc.spec
@@ -141,8 +141,11 @@ required.
 # (https://github.com/rpm-software-management/rpm/issues/3126)
 if [ -e "/usr/lib64/qt5/bin/qdoc" ]; then
 echo "Redefining _libdir to work around rpm behaviour change"
-%define _libdir /usr/lib64
+_libdir=/usr/lib64
+else
+_libdir=/usr/lib
 fi
+%define _libdir $_libdir
 
 # We need to link to some of the programs used as that the source assumes they were just built.
 ln -s %{_bindir}/rcc-qt5 qtbase/bin/rcc