diff --git a/processor/processor.go b/processor/processor.go
index 88384b0..622a217 100644
--- a/processor/processor.go
+++ b/processor/processor.go
@@ -501,7 +501,7 @@ func EvalRegex(L *lua.LState) int {
 	if len(matches) > 0 {
 		matchesTable := L.NewTable()
 		for i, match := range matches {
-			matchesTable.RawSetInt(i, lua.LString(match))
+			matchesTable.RawSetString(fmt.Sprintf("%d", i), lua.LString(match))
 			evalRegexLogger.Debug("Set table[%d] = %q", i, match)
 		}
 		L.Push(matchesTable)