diff --git a/autoload/ale/job.vim b/autoload/ale/job.vim
index a52e57bcf7..1d8b6760bb 100644
--- a/autoload/ale/job.vim
+++ b/autoload/ale/job.vim
@@ -244,7 +244,7 @@ function! ale#job#Start(command, options) abort
         let l:job_id = ale#job#ParseVim8ProcessID(string(l:job_info.job))
     endif
 
-    if l:job_id
+    if l:job_id > 0
         " Store the job in the map for later only if we can get the ID.
         let s:job_map[l:job_id] = l:job_info
     endif