diff --git a/syntax/sust.vim b/syntax/sust.vim
index c6a1d31..acf1493 100644
--- a/syntax/sust.vim
+++ b/syntax/sust.vim
@@ -3,7 +3,7 @@ if exists("b:current_syntax")
 endif
 
 " syntax keyword Label args
-syn match Number /[ \r\n\t\f\v\-]*\d*[ \r\n\t\f\v$]*/
+syn match Number /[ \r\n\t\v\-]*\d*[ \r\n\t\v$]*/
 syn keyword Special FUNC RETURN FUNC_END
 syn keyword Statement INIT_VAR SET_VAR TEMP_VAR MOVE_VAR COPY_VAR DROP_VAR HAS_VAR LIST_SIZE TO_STRING ADD_INT ADD_FLOAT ADD_STR SUB_STR SUB_LIST FOR FOR_MAP FOR_LIST WHILE WRITE READ READ_ALL READ_STR READ_STR_ALL OPEN_FILE_IN OPEN_FILE_OUT OPEN_TCP_CONNECTION OPEN_TCP_LISTENER EQUALS MORE LESS AND OR IF HAS_STR HAS_ITEM HAS_ENTRY HAS_KEY HAS_VALUE HAS_OPTIONAL USE_FUNC SLEEP NEW_THREAD
 syn keyword Type bool string integer float char list map optinal in_stream out_stream