diff --git a/sympa/recipe/sympa_fix_personalization.recipe b/sympa/recipe/sympa_fix_personalization.recipe
index edb734d..718fa4b 100644
--- a/sympa/recipe/sympa_fix_personalization.recipe
+++ b/sympa/recipe/sympa_fix_personalization.recipe
@@ -30,7 +30,8 @@ function patch_message_pm {
 			echo 'already patched!'
 		fi
 		message=$(prepend_2lines_of_text_before_existing_line "$MESSAGE_PM" '$data->{sender} = $self->{sender};' '$data->{gecos} = $self->{gecos};' '$data->{subject} = $self->{decoded_subject};')
-		if [[ $message =~ 'do prepend' ]]; then
+		echo $message
+		if [[ $message == 'do prepend' ]]; then
 			echo 'prepending sender and gecos in message pm'
 			FOUND=true
 		else