diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c
index 9ae4c0d4ea..3c031aaa86 100644
--- a/hw/i386/acpi-build.c
+++ b/hw/i386/acpi-build.c
@@ -2440,8 +2440,7 @@ acpi_build_srat_memory(AcpiSratMemoryAffinity *numamem, uint64_t base,
 {
     numamem->type = ACPI_SRAT_MEMORY;
     numamem->length = sizeof(*numamem);
-    memset(numamem->proximity, 0, 4);
-    numamem->proximity[0] = node;
+    numamem->proximity = cpu_to_le32(node);
     numamem->flags = cpu_to_le32(flags);
     numamem->base_addr = cpu_to_le64(base);
     numamem->range_length = cpu_to_le64(len);
diff --git a/include/hw/acpi/acpi-defs.h b/include/hw/acpi/acpi-defs.h
index bcf5c3ff77..850a9626b7 100644
--- a/include/hw/acpi/acpi-defs.h
+++ b/include/hw/acpi/acpi-defs.h
@@ -475,7 +475,7 @@ typedef struct AcpiSratProcessorAffinity AcpiSratProcessorAffinity;
 struct AcpiSratMemoryAffinity
 {
     ACPI_SUB_HEADER_DEF
-    uint8_t     proximity[4];
+    uint32_t    proximity;
     uint16_t    reserved1;
     uint64_t    base_addr;
     uint64_t    range_length;