diff --git a/os/rt/ports/ARMCMx/chcore_v7m.c b/os/rt/ports/ARMCMx/chcore_v7m.c
index 518d162b9..da9368caa 100644
--- a/os/rt/ports/ARMCMx/chcore_v7m.c
+++ b/os/rt/ports/ARMCMx/chcore_v7m.c
@@ -64,7 +64,7 @@ void SVC_Handler(void) {
 
 #if CORTEX_USE_FPU
   /* Enforcing unstacking of the FP part of the context.*/
-  SCB_FPCCR &= ~FPCCR_LSPACT;
+  FPU->FPCCR &= ~FPU_FPCCR_LSPACT_Msk;
 #endif
 
   /* The port_extctx structure is pointed by the PSP register.*/
@@ -94,7 +94,7 @@ void PendSV_Handler(void) {
 
 #if CORTEX_USE_FPU
   /* Enforcing unstacking of the FP part of the context.*/
-  SCB_FPCCR &= ~FPCCR_LSPACT;
+  FPU->FPCCR &= ~FPU_FPCCR_LSPACT_Msk;
 #endif
 
   /* The port_extctx structure is pointed by the PSP register.*/