diff --git a/tools/input_editing/vim/vim.xsl b/tools/input_editing/vim/vim.xsl
index 998553983b..9f4c2a3240 100644
--- a/tools/input_editing/vim/vim.xsl
+++ b/tools/input_editing/vim/vim.xsl
@@ -119,6 +119,7 @@ syn region cp2kString matchgroup=cp2kStringDelimiter start=+`+ end=+`+
 
 setlocal autoindent
 setlocal expandtab
+setlocal iskeyword+=-
 
 "----------------------------------------------------------------------------/
 " Indentation support for CP2K input syntax