diff --git a/ps/output.c b/ps/output.c
index a60c98e8..e718f198 100644
--- a/ps/output.c
+++ b/ps/output.c
@@ -2120,6 +2120,7 @@ void show_one_proc(const proc_t *restrict const p, const format_node *restrict f
     if(unlikely(space>SPACE_AMOUNT)) space=SPACE_AMOUNT;  // only so much available
 
     /* real size -- don't forget in 'amount' is number of cells */
+    outbuf[OUTBUF_SIZE-1] = '\0';
     sz = strlen(outbuf);
 
     /* print data, set x position stuff */