diff --git a/code/modules/mapping/reader.dm b/code/modules/mapping/reader.dm
index e5a323d0725..fcb5b445b41 100644
--- a/code/modules/mapping/reader.dm
+++ b/code/modules/mapping/reader.dm
@@ -102,7 +102,7 @@
 	/// Matches key formats in TMG (IE: newline after the \()
 	var/static/regex/matches_tgm = new(@'^"[A-z]*"[\s]*=[\s]*\([\s]*\n', "m")
 	/// Pulls out key value pairs for TGM
-	var/static/regex/var_edits_tgm = new(@'^\t([A-z]*) = (.*?);?$')
+	var/static/regex/var_edits_tgm = new(@'^\t([A-z0-9]*) = (.*?);?$')
 	/// Pulls out model paths for DMM
 	var/static/regex/model_path = new(@'(\/[^\{]*?(?:\{.*?\})?)(?:,|$)', "g")