diff --git a/linux-user/arm/cpu_loop.c b/linux-user/arm/cpu_loop.c
index 7416e3216e..098b54d10e 100644
--- a/linux-user/arm/cpu_loop.c
+++ b/linux-user/arm/cpu_loop.c
@@ -362,6 +362,7 @@ void cpu_loop(CPUARMState *env)
                     switch (n) {
                     case ARM_NR_cacheflush:
                         /* nop */
+                        env->regs[0] = 0;
                         break;
                     case ARM_NR_set_tls:
                         cpu_set_tls(env, env->regs[0]);