diff --git a/hw/arm/xilinx_zynq.c b/hw/arm/xilinx_zynq.c
index c14774e542..3a0fa5b23f 100644
--- a/hw/arm/xilinx_zynq.c
+++ b/hw/arm/xilinx_zynq.c
@@ -16,6 +16,7 @@
  */
 
 #include "qemu/osdep.h"
+#include "qemu/units.h"
 #include "qapi/error.h"
 #include "cpu.h"
 #include "hw/sysbus.h"
@@ -194,7 +195,7 @@ static void zynq_init(MachineState *machine)
     memory_region_add_subregion(address_space_mem, 0, ext_ram);
 
     /* 256K of on-chip memory */
-    memory_region_init_ram(ocm_ram, NULL, "zynq.ocm_ram", 256 << 10,
+    memory_region_init_ram(ocm_ram, NULL, "zynq.ocm_ram", 256 * KiB,
                            &error_fatal);
     memory_region_add_subregion(address_space_mem, 0xFFFC0000, ocm_ram);