diff --git a/spec/support/matchers/source.rb b/spec/support/matchers/source.rb
index 55145ab..e6b391b 100644
--- a/spec/support/matchers/source.rb
+++ b/spec/support/matchers/source.rb
@@ -20,7 +20,7 @@ def matches?(table)
             SELECT prosrc FROM pg_catalog.pg_proc WHERE proname = ?
           SQL
 
-          !(source =~ @regexp).nil?
+          @regexp.match?(source)
         end
 
         def failure_message