diff --git a/include/nuttx/sched.h b/include/nuttx/sched.h
index 05d0de897e..710c2ef6cf 100644
--- a/include/nuttx/sched.h
+++ b/include/nuttx/sched.h
@@ -766,7 +766,7 @@ struct pthread_tcb_s
  */
 
 #ifdef CONFIG_DEBUG_TCBINFO
-struct tcbinfo_s
+begin_packed_struct struct tcbinfo_s
 {
   uint16_t pid_off;                      /* Offset of tcb.pid               */
   uint16_t state_off;                    /* Offset of tcb.task_state        */
@@ -787,7 +787,7 @@ struct tcbinfo_s
     uint8_t       u[8];
     FAR uint16_t *p;
   } reg_off;
-};
+} end_packed_struct;
 #endif
 
 /* This is the callback type used by nxsched_foreach() */
diff --git a/tools/jlink-nuttx.c b/tools/jlink-nuttx.c
index 245f759d0a..b7597dfad7 100644
--- a/tools/jlink-nuttx.c
+++ b/tools/jlink-nuttx.c
@@ -72,7 +72,7 @@ enum symbol_e
   NSYMBOLS
 };
 
-struct tcbinfo_s
+__attribute__ ((packed)) struct tcbinfo_s
 {
   uint16_t pid_off;
   uint16_t state_off;