diff --git a/auto/bin/parse_spec.pl b/auto/bin/parse_spec.pl
index 3041def..98415fa 100755
--- a/auto/bin/parse_spec.pl
+++ b/auto/bin/parse_spec.pl
@@ -140,7 +140,7 @@ my %regex = (
     prefix   => qr/^(?:[aw]?gl|glX)/, # gl | agl | wgl | glX
     tprefix  => qr/^(?:[AW]?GL|GLX)_/, # GL_ | AGL_ | WGL_ | GLX_
     section  => compile_regex('^(', join('|', @sections), ')$'), # sections in spec
-    token    => qr/^([A-Z0-9][A-Z0-9_]*):?\s+((?:0x)?[0-9A-F]+)(.*)$/, # define tokens
+    token    => qr/^([A-Z0-9][A-Z0-9_x]*):?\s+((?:0x)?[0-9A-F]+)(.*)$/, # define tokens
     types    => compile_regex('\b(', join('|', keys %typemap), ')\b'), # var types
     voidtype => compile_regex('\b(', keys %voidtypemap, ')\b '), # void type
 );