diff --git a/arch/arm/src/armv8-m/arm_doirq.c b/arch/arm/src/armv8-m/arm_doirq.c
index a86de9f7e78e1..5f902b1edacad 100644
--- a/arch/arm/src/armv8-m/arm_doirq.c
+++ b/arch/arm/src/armv8-m/arm_doirq.c
@@ -55,6 +55,7 @@ void exception_direct(void)
       "vmsr fpscr, r0\n"
       :
       : "i" (ARMV8M_FPSCR_LTPSIZE_NONE)
+      : "r0"
     );
 #endif