diff --git a/epan/dtd_parse.l b/epan/dtd_parse.l
index dffb2f1db1..91830a4956 100644
--- a/epan/dtd_parse.l
+++ b/epan/dtd_parse.l
@@ -147,7 +147,7 @@ comma          ","
 pipe           "|"
 dquote         ["]
 
-name           [A-Za-z][-a-z0-9_][-a-zA-Z0-9_]*
+name           [A-Za-z][-a-zA-Z0-9_]*
 dquoted        ["][^\"]*["]
 squoted        ['][^\']*[']