diff --git a/core_gem/lib/deep_cover/tools/scan_match_datas.rb b/core_gem/lib/deep_cover/tools/scan_match_datas.rb
index 76da0ea9..aaf703a3 100644
--- a/core_gem/lib/deep_cover/tools/scan_match_datas.rb
+++ b/core_gem/lib/deep_cover/tools/scan_match_datas.rb
@@ -4,7 +4,16 @@ module DeepCover
   module Tools::ScanMatchDatas
     # Like String#scan, but return the MatchData object instead
     def scan_match_datas(source, matcher)
-      source.to_enum(:scan, matcher).map { Regexp.last_match }
+      # This has wrong behavior in truffleruby
+      # source.to_enum(:scan, matcher).map { Regexp.last_match }
+      # This is the fool-proof way of doing it. Maybe some checks for perf should be done
+      start_at = 0
+      matches = []
+      while (match = source.match(matcher, start_at))
+        matches.push(match)
+        start_at = match.end(0)
+      end
+      matches
     end
   end
 end