--- src/pstree.c
+++ src/pstree.c
@@ -70,7 +70,7 @@
 
 typedef struct _proc
 {
-  char comm[COMM_LEN + 1];
+  char comm[COMM_LEN + 2 + 1];  /* add another 2 for thread brackets */
   char **argv;			/* only used : argv[0] is 1st arg; undef if argc < 1 */
   int argc;			/* with -a   : number of arguments, -1 if swapped    */
   pid_t pid;