diff --git a/challenges/03-front-end-libraries/sass.json b/challenges/03-front-end-libraries/sass.json
index ff348a547e2..7cb6986b6eb 100644
--- a/challenges/03-front-end-libraries/sass.json
+++ b/challenges/03-front-end-libraries/sass.json
@@ -166,12 +166,12 @@
" "
],
"tests": [
- "assert(code.match(/@mixin\\s+?border-radius\\(\\$radius\\)\\s*?{/gi), 'message: Your code should declare a mixin named border-radius which has a parameter named $radius.');",
+ "assert(code.match(/@mixin\\s+?border-radius\\(\\s*?\\$radius\\s*?\\)\\s*?{/gi), 'message: Your code should declare a mixin named border-radius which has a parameter named $radius.');",
"assert(code.match(/-webkit-border-radius:\\s*?\\$radius;/gi), 'message: Your code should include the -webkit-border-radius vender prefix that uses the $radius parameter.');",
"assert(code.match(/-moz-border-radius:\\s*?\\$radius;/gi), 'message: Your code should include the -moz-border-radius vender prefix that uses the $radius parameter.');",
"assert(code.match(/-ms-border-radius:\\s*?\\$radius;/gi), 'message: Your code should include the -ms-border-radius vender prefix that uses the $radius parameter.');",
"assert(code.match(/border-radius:\\s*?\\$radius;/gi).length == 4, 'message: Your code should include the general border-radius rule that uses the $radius parameter.');",
- "assert(code.match(/@include\\s+?border-radius\\(15px\\);/gi), 'message: Your code should call the border-radius mixin using the @include keyword, setting it to 15px.');"
+ "assert(code.match(/@include\\s+?border-radius\\(\\s*?15px\\s*?\\);/gi), 'message: Your code should call the border-radius mixin using the @include keyword, setting it to 15px.');"
],
"solutions": [],
"hints": [],