diff --git a/custom/history-substring-search.zsh b/custom/history-substring-search.zsh
new file mode 100644
index 00000000..6c54f045
--- /dev/null
+++ b/custom/history-substring-search.zsh
@@ -0,0 +1,4 @@
+if [[ "$DISABLE_COLOR" == "true" ]]; then
+  F_ordinary_highlight="bg=none,fg=none"
+  F_out_of_matches_highlight="bg=none,fg=none"
+fi