diff --git a/opensc.spec b/opensc.spec
index a00f3e8..4b61999 100644
--- a/opensc.spec
+++ b/opensc.spec
@@ -74,6 +74,8 @@ autoreconf -fvi
 sed -i -e 's/opensc.conf/opensc-%{_arch}.conf/g' src/libopensc/Makefile.in
 %endif
 sed -i -e 's|"/lib /usr/lib\b|"/%{_lib} %{_libdir}|' configure # lib64 rpaths
+%set_build_flags
+CFLAGS="$CFLAGS -Wstrict-aliasing=2"
 %configure  --disable-static \
   --disable-autostart-items \
   --disable-notify \