diff --git a/syntax/include/arm_base_syntax.vim b/syntax/include/arm_base_syntax.vim
index eb3a73f..b721d5a 100644
--- a/syntax/include/arm_base_syntax.vim
+++ b/syntax/include/arm_base_syntax.vim
@@ -1,4 +1,6 @@
 
+setlocal iskeyword  +=.,_
+
 syn keyword armTodo     contained todo fixme danger note notice bug author date
 
 syn match armNumericOp  "[+-/*%<>=&|^!]"