diff --git a/headers.sh b/headers.sh
index cc28c42..94092d5 100755
--- a/headers.sh
+++ b/headers.sh
@@ -9,5 +9,5 @@ VERTICAL_HEADERS=(
 )
 
 for header in "${VERTICAL_HEADERS[@]}"; do
-    sed -z "s/$header/\\\rot{$header}/g" metrics.tex > tmp; mv tmp metrics.tex
+    sed "/:/! s/$header/\\\rot{$header}/g" metrics.tex > tmp; mv tmp metrics.tex
 done
\ No newline at end of file