diff --git a/entrypoint.sh b/entrypoint.sh
index caaae13..87d5f34 100755
--- a/entrypoint.sh
+++ b/entrypoint.sh
@@ -5,11 +5,11 @@ set -ex
 INPUT_SEPARATOR="${INPUT_SEPARATOR//\%/%25}"
 INPUT_SEPARATOR="${INPUT_SEPARATOR//\./%2E}"
 
-NEWLINE_SEPARATOR="\n"
+NEWLINE_SEPARATOR='\n'
 URLENCODED_NEWLINE_SEPARATOR='%0A'
 INPUT_SEPARATOR="${INPUT_SEPARATOR//$NEWLINE_SEPARATOR/$URLENCODED_NEWLINE_SEPARATOR}"
 
-CARRIAGE_RETURN="\r"
+CARRIAGE_RETURN='\r'
 URLENCODED_CARRIAGE_RETURN='%0D'
 INPUT_SEPARATOR="${INPUT_SEPARATOR//$CARRIAGE_RETURN/$URLENCODED_CARRIAGE_RETURN}"