diff --git a/lib/httpx/response.rb b/lib/httpx/response.rb
index 0a76d558..4bbdc776 100644
--- a/lib/httpx/response.rb
+++ b/lib/httpx/response.rb
@@ -316,7 +316,7 @@ module HTTPX
 
     if Exception.method_defined?(:full_message)
       def to_s
-        @error.full_message
+        @error.full_message(highlight: false)
       end
     else
       def to_s