diff --git a/arch/arm/src/common/up_unblocktask.c b/arch/arm/src/common/up_unblocktask.c
index 97c41618250..f907c6161f4 100644
--- a/arch/arm/src/common/up_unblocktask.c
+++ b/arch/arm/src/common/up_unblocktask.c
@@ -101,7 +101,7 @@ void up_unblock_task(_TCB *tcb)
        */
 
 #if CONFIG_RR_INTERVAL > 0
-      tcb->timeslice = CONFIG_RR_INTERVAL;
+      tcb->timeslice = CONFIG_RR_INTERVAL / MSEC_PER_SEC;
 #endif
 
       /* Add the task in the correct location in the prioritized
diff --git a/arch/c5471/src/up_unblocktask.c b/arch/c5471/src/up_unblocktask.c
index a51a5d621cf..0d7f91ca563 100644
--- a/arch/c5471/src/up_unblocktask.c
+++ b/arch/c5471/src/up_unblocktask.c
@@ -101,7 +101,7 @@ void up_unblock_task(_TCB *tcb)
       */
 
 #if CONFIG_RR_INTERVAL > 0
-     tcb->timeslice = CONFIG_RR_INTERVAL;
+     tcb->timeslice = CONFIG_RR_INTERVAL / MSEC_PER_SEC;
 #endif
 
      /* Add the task in the correct location in the prioritized
diff --git a/arch/dm320/src/up_unblocktask.c b/arch/dm320/src/up_unblocktask.c
index 15efb7a4714..c17760b87d2 100644
--- a/arch/dm320/src/up_unblocktask.c
+++ b/arch/dm320/src/up_unblocktask.c
@@ -100,7 +100,7 @@ void up_unblock_task(_TCB *tcb)
       */
 
 #if CONFIG_RR_INTERVAL > 0
-     tcb->timeslice = CONFIG_RR_INTERVAL;
+     tcb->timeslice = CONFIG_RR_INTERVAL / MSEC_PER_SEC;
 #endif
 
      /* Add the task in the correct location in the prioritized
diff --git a/arch/pjrc-8051/src/up_unblocktask.c b/arch/pjrc-8051/src/up_unblocktask.c
index 005e74e545e..2f242fe0fb7 100644
--- a/arch/pjrc-8051/src/up_unblocktask.c
+++ b/arch/pjrc-8051/src/up_unblocktask.c
@@ -101,7 +101,7 @@ void up_unblock_task(FAR _TCB *tcb)
       */
 
 #if CONFIG_RR_INTERVAL > 0
-     tcb->timeslice = CONFIG_RR_INTERVAL;
+     tcb->timeslice = CONFIG_RR_INTERVAL / MSEC_PER_SEC;
 #endif
 
      /* Add the task in the correct location in the prioritized
diff --git a/arch/sim/src/up_unblocktask.c b/arch/sim/src/up_unblocktask.c
index bf3148506aa..b17fd4d4834 100644
--- a/arch/sim/src/up_unblocktask.c
+++ b/arch/sim/src/up_unblocktask.c
@@ -100,7 +100,7 @@ void up_unblock_task(_TCB *tcb)
       */
 
 #if CONFIG_RR_INTERVAL > 0
-     tcb->timeslice = CONFIG_RR_INTERVAL;
+     tcb->timeslice = CONFIG_RR_INTERVAL / MSEC_PER_SEC;
 #endif
 
      /* Add the task in the correct location in the prioritized