diff --git a/src/bytes_regex.cr b/src/bytes_regex.cr
index 6f6c8d9..1345ad3 100644
--- a/src/bytes_regex.cr
+++ b/src/bytes_regex.cr
@@ -3,7 +3,7 @@ module BytesRegex
 
   class Regex
     def initialize(pattern : String, multiline = false, dotall = false, ignorecase = false, anchored = false)
-      flags = LibPCRE2::UTF | LibPCRE2::DUPNAMES | LibPCRE2::UCP | LibPCRE2::NO_UTF_CHECK
+      flags = LibPCRE2::UTF | LibPCRE2::UCP | LibPCRE2::NO_UTF_CHECK
       flags |= LibPCRE2::MULTILINE if multiline
       flags |= LibPCRE2::DOTALL if dotall
       flags |= LibPCRE2::CASELESS if ignorecase
@@ -40,9 +40,7 @@ module BytesRegex
         LibPCRE2::NO_UTF_CHECK,
         @match_data,
         nil)
-      if rc < 0
-        # No match, do nothing
-      else
+      if rc > 0
         ovector = LibPCRE2.get_ovector_pointer(@match_data)
         (0...rc).each do |i|
           m_start = ovector[2 * i]