diff --git a/babblesim/hw/bsp/nrf52_bsim/src/arch/bsim_arch/os_arch.c b/babblesim/hw/bsp/nrf52_bsim/src/arch/bsim_arch/os_arch.c
index 8277ae7ca..b545688cc 100644
--- a/babblesim/hw/bsp/nrf52_bsim/src/arch/bsim_arch/os_arch.c
+++ b/babblesim/hw/bsp/nrf52_bsim/src/arch/bsim_arch/os_arch.c
@@ -148,7 +148,7 @@ os_arch_restore_sr(os_sr_t osr)
 {
     hw_irq_ctrl_change_lock(osr);
 
-    if (!osr && bsim_pend_sv) {
+    if (!osr && bsim_pend_sv && !os_arch_in_isr()) {
         do_ctx_sw();
     }
 }