diff --git a/lib/uri/common.rb b/lib/uri/common.rb
index 8542c51..cf93fb1 100644
--- a/lib/uri/common.rb
+++ b/lib/uri/common.rb
@@ -46,9 +46,9 @@ def self.parser=(parser = RFC3986_PARSER)
   self.parser = RFC3986_PARSER
 
   def self.const_missing(const)
-    if RFC2396_PARSER.regexp[const]
+    if value = RFC2396_PARSER.regexp[const]
       warn "URI::#{const} is obsolete. Use RFC2396_PARSER.regexp[#{const.inspect}] explicitly.", uplevel: 1 if $VERBOSE
-      RFC2396_PARSER.regexp[const]
+      value
     else
       super
     end