diff --git a/Userland/Libraries/LibRegex/RegexParser.cpp b/Userland/Libraries/LibRegex/RegexParser.cpp
index 814759de4e..b2b7c19f6d 100644
--- a/Userland/Libraries/LibRegex/RegexParser.cpp
+++ b/Userland/Libraries/LibRegex/RegexParser.cpp
@@ -411,7 +411,7 @@ bool PosixBasicParser::parse_nonduplicating_re(ByteCode& bytecode, size_t& match
     if (try_skip("\\(")) {
         ByteCode capture_bytecode;
         size_t capture_length_minimum = 0;
-        auto capture_group_index = ++m_capture_group;
+        auto capture_group_index = ++m_parser_state.capture_groups_count;
 
         if (!parse_re_expression(capture_bytecode, capture_length_minimum))
             return false;
diff --git a/Userland/Libraries/LibRegex/RegexParser.h b/Userland/Libraries/LibRegex/RegexParser.h
index b4d1cc95e9..5be99edbba 100644
--- a/Userland/Libraries/LibRegex/RegexParser.h
+++ b/Userland/Libraries/LibRegex/RegexParser.h
@@ -155,7 +155,6 @@ private:
     bool parse_nonduplicating_re(ByteCode&, size_t&);
     bool parse_one_char_or_collation_element(ByteCode&, size_t&);
 
-    size_t m_capture_group { 0 };
     constexpr static size_t number_of_addressable_capture_groups = 9;
     size_t m_capture_group_minimum_lengths[number_of_addressable_capture_groups] { 0 };
     bool m_capture_group_seen[number_of_addressable_capture_groups] { false };