diff --git a/libreoffice.spec b/libreoffice.spec
index ddfbdf2..dfefc5d 100644
--- a/libreoffice.spec
+++ b/libreoffice.spec
@@ -2943,7 +2943,7 @@ chmod 777 ~/tmp
 chmod +x bin/unpack-sources
 
 %if %{with clang}
-grep -Irl 'include <string_view>' | \
+grep -IrlE 'include[[:blank:]]([[:blank:]])*<string_view>' | xargs \
 	sed -i -E -e 's,include[[:blank:]]([[:blank:]])*<string_view>,include <experimental/string_view>,g'
 %endif