diff --git a/libs/parser/rules/pslang.l b/libs/parser/rules/pslang.l
index 8d0206b..9d7b33e 100644
--- a/libs/parser/rules/pslang.l
+++ b/libs/parser/rules/pslang.l
@@ -46,7 +46,7 @@ u64  { return bp::make_u64(ctx.location); }
 f32  { return bp::make_f32(ctx.location); }
 f64  { return bp::make_f64(ctx.location); }
 
-[a-z]+ { return bp::make_name(yytext, ctx.location); }
+[a-zA-Z_]+[a-zA-Z0-9_]* { return bp::make_name(yytext, ctx.location); }
 
 "\n" { ctx.location.lines(1); return bp::make_newline(ctx.location); }
 "\t" { return bp::make_indent(ctx.location); }