diff --git a/libreoffice.spec b/libreoffice.spec
index 302adeb..f089090 100644
--- a/libreoffice.spec
+++ b/libreoffice.spec
@@ -1095,7 +1095,7 @@ ARCH_FLAGS="`echo %{optflags} -flifetime-dse=1 | sed -e 's/^-g /-g1 /g' -e 's/ -
 ARCH_FLAGS="`echo %{optflags} | sed -e 's/^-g /-g1 /g' -e 's/ -g / -g1 /g' -e 's/ -g$/ -g1/g'`"
 %endif
 CFLAGS="$ARCH_FLAGS"
-CXXFLAGS="$ARCH_FLAGS"
+CXXFLAGS="-std=c++17 $ARCH_FLAGS"
 export ARCH_FLAGS CFLAGS CXXFLAGS
 
 %if !0%{?is_opensuse} && 0%{?sle_version} < 150000