diff --git a/qemu/target/arm/helper.c b/qemu/target/arm/helper.c
index aa376e10..e75d4e55 100644
--- a/qemu/target/arm/helper.c
+++ b/qemu/target/arm/helper.c
@@ -5112,6 +5112,7 @@ static void zcr_write(CPUARMState *env, const ARMCPRegInfo *ri,
     int new_len;
 
     /* Bits other than [3:0] are RAZ/WI.  */
+    QEMU_BUILD_BUG_ON(ARM_MAX_VQ > 16);
     raw_write(env, ri, value & 0xf);
 
     /*