diff --git a/hw/s390x/ipl.h b/hw/s390x/ipl.h
index 9e90169695..dfc6dfd89c 100644
--- a/hw/s390x/ipl.h
+++ b/hw/s390x/ipl.h
@@ -32,7 +32,7 @@ struct IPLBlockPV {
     uint32_t num_comp;          /* 0x74 */
     uint64_t pv_header_addr;    /* 0x78 */
     uint64_t pv_header_len;     /* 0x80 */
-    struct IPLBlockPVComp components[];
+    struct IPLBlockPVComp components[0];
 } QEMU_PACKED;
 typedef struct IPLBlockPV IPLBlockPV;
 
@@ -63,7 +63,7 @@ struct IplBlockFcp {
     uint64_t br_lba;
     uint32_t scp_data_len;
     uint8_t  reserved6[260];
-    uint8_t  scp_data[];
+    uint8_t  scp_data[0];
 } QEMU_PACKED;
 typedef struct IplBlockFcp IplBlockFcp;