diff --git a/syntax/quox.vim b/syntax/quox.vim
index 33ff89f..985ef45 100644
--- a/syntax/quox.vim
+++ b/syntax/quox.vim
@@ -45,13 +45,13 @@ hi def link quoxTag Constant
 syn match quoxCharEsc /\\\%(\\\|"\|x\x\+;\|[nt]\)/ contained
 hi def link quoxCharEsc SpecialChar
 
-syn match quoxQty /\<[01#ω]\./
+syn match quoxQty /\<[01#ω]\.\d\@!/
 hi def link quoxQty Special
 
 syn match quoxDef /\<\%(def\|postulate\)[01#ω]\?\>/ contains=quoxQtySuffix
 syn match quoxQtySuffix /[01#ω]\>/ contained
 hi def link quoxDef Label
-hi def link quoxQtySuffix quoxQty
+hi link quoxQtySuffix quoxQty
 
 syn keyword quoxNamespace namespace
 hi def link quoxNamespace Type