diff --git a/doc/rt/reports/STM32F407-168-GCC.txt b/doc/rt/reports/STM32F407-168-GCC.txt
index f814e3f86..7e38f9edc 100644
--- a/doc/rt/reports/STM32F407-168-GCC.txt
+++ b/doc/rt/reports/STM32F407-168-GCC.txt
@@ -6,8 +6,8 @@ Settings: SYSCLK=168, ACR=0x705 (5 wait states)
 *** ChibiOS/RT test suite
 ***
 *** Kernel:       3.0.0dev
-*** Compiled:     Dec 11 2014 - 16:38:49
-*** Compiler:     GCC 4.7.3 20130312 (release) [ARM/embedded-4_7-branch revision 196615]
+*** Compiled:     Mar 23 2015 - 11:26:02
+*** Compiler:     GCC 4.7.4 20140401 (release) [ARM/embedded-4_7-branch revision 209195]
 *** Architecture: ARMv7-ME
 *** Core Variant: Cortex-M4
 *** Port Info:    Advanced kernel mode
@@ -130,7 +130,7 @@ Settings: SYSCLK=168, ACR=0x705 (5 wait states)
 --- Result: SUCCESS
 ----------------------------------------------------------------------------
 --- Test Case 11.10 (Benchmark, virtual timers set/reset)
---- Score : 1322832 timers/S
+--- Score : 1322828 timers/S
 --- Result: SUCCESS
 ----------------------------------------------------------------------------
 --- Test Case 11.11 (Benchmark, semaphores wait/signal)
@@ -156,4 +156,3 @@ Settings: SYSCLK=168, ACR=0x705 (5 wait states)
 ----------------------------------------------------------------------------
 
 Final result: SUCCESS
-
diff --git a/os/rt/include/chvt.h b/os/rt/include/chvt.h
index 1bc83d908..736d572b4 100644
--- a/os/rt/include/chvt.h
+++ b/os/rt/include/chvt.h
@@ -494,6 +494,15 @@ static inline void chVTDoTickI(void) {
     ch.vtlist.vt_next = vtp->vt_next;
     fn = vtp->vt_func;
     vtp->vt_func = NULL;
+
+    /* If the list is empty then the timer is stopped.*/
+    if (&ch.vtlist == (virtual_timers_list_t *)ch.vtlist.vt_next) {
+      port_timer_stop_alarm();
+    }
+
+    /* Leaving the system critical zone in order to execute the callback
+       and in order to give a preemption chance to higher priority
+       interrupts.*/
     chSysUnlockFromISR();
 
     /* The callback is invoked outside the kernel critical zone.*/
@@ -503,10 +512,11 @@ static inline void chVTDoTickI(void) {
        of the list.*/
     chSysLockFromISR();
 
-    /* Next element in the list, if the list is empty then ending the loop.*/
+    /* If the list is empty then ending the loop, the list has to be
+       re-checked because new timers could have been added from within
+       the callback.*/
     vtp = ch.vtlist.vt_next;
     if (&ch.vtlist == (virtual_timers_list_t *)vtp) {
-      port_timer_stop_alarm();
       return;
     }