diff --git a/gtk3.spec b/gtk3.spec
index 61c904b..9a44cf4 100644
--- a/gtk3.spec
+++ b/gtk3.spec
@@ -163,6 +163,7 @@ the functionality of the installed %{name} package.
 %setup -q -n gtk+-%{version}
 
 %build
+export CFLAGS='-fno-strict-aliasing %optflags'
 (if ! test -x configure; then NOCONFIGURE=1 ./autogen.sh; CONFIGFLAGS=--enable-gtk-doc; fi;
  %configure $CONFIGFLAGS \
         --enable-xkb \