diff --git a/userspace/engine/lua/parser.lua b/userspace/engine/lua/parser.lua
index 00adf9dd..7fb5a317 100644
--- a/userspace/engine/lua/parser.lua
+++ b/userspace/engine/lua/parser.lua
@@ -237,7 +237,7 @@ local G = {
   Identifier = V"idStart" * V"idRest"^0;
   Macro = V"idStart" * V"idRest"^0 * -P".";
   Int = digit^1;
-  PathString = (alnum + S'-_/*?')^1;
+  PathString = (alnum + S'.-_/*?')^1;
   Index = V"Int" + V"PathString";
   FieldName = V"Identifier" * (P"." + V"Identifier")^1 * (P"[" * V"Index" * P"]")^-1;
   Name = C(V"Identifier") * -V"idRest";