diff --git a/arch/arm64/src/common/arm64_syscall.c b/arch/arm64/src/common/arm64_syscall.c
index 6e837df1c23..ab1a67f4660 100644
--- a/arch/arm64/src/common/arm64_syscall.c
+++ b/arch/arm64/src/common/arm64_syscall.c
@@ -269,13 +269,13 @@ uint64_t *arm64_syscall(uint64_t *regs)
 
               /* Create a frame for info and copy the kernel info */
 
-              rtcb->xcp.ustkptr = (uintptr_t *)read_sysreg(sp_el0);
+              rtcb->xcp.ustkptr = (uintptr_t *)regs[REG_SP_EL0];
               usp = (uintptr_t)rtcb->xcp.ustkptr - sizeof(siginfo_t);
               memcpy((void *)usp, (void *)regs[REG_X2], sizeof(siginfo_t));
 
               /* Now set the updated SP and user copy of "info" to R2 */
 
-              write_sysreg(usp, sp_el0);
+              regs[REG_SP_EL0] = usp;
               regs[REG_X2] = usp;
             }
 #endif