diff --git a/vimrc b/vimrc
index 2eb2a2a..d5a2cf3 100644
--- a/vimrc
+++ b/vimrc
@@ -70,10 +70,18 @@ set nowb
 set swapfile
 
 " Indentation, etc.
-set tabstop=3
+if exists("$EXPANDTAB")
+	set expandtab
+else
+	set noexpandtab
+end
+if exists("$TABSTOP")
+	let &tabstop=str2nr($TABSTOP)
+else
+	set tabstop=3
+end
 set shiftwidth=0 " Not needed
 set softtabstop=0 " Not needed
-set noexpandtab
 set smarttab
 set autoindent
 set smartindent