diff --git a/tests/acpi-utils.c b/tests/acpi-utils.c
index a0d49c4371..c216b9e0e9 100644
--- a/tests/acpi-utils.c
+++ b/tests/acpi-utils.c
@@ -51,7 +51,7 @@ uint32_t acpi_find_rsdp_address(QTestState *qts)
     return off;
 }
 
-void acpi_fetch_rsdp_table(QTestState *qts, uint32_t addr, uint8_t *rsdp_table)
+void acpi_fetch_rsdp_table(QTestState *qts, uint64_t addr, uint8_t *rsdp_table)
 {
     uint8_t revision;
 
diff --git a/tests/acpi-utils.h b/tests/acpi-utils.h
index a4f43a18ae..0ceb499469 100644
--- a/tests/acpi-utils.h
+++ b/tests/acpi-utils.h
@@ -46,7 +46,7 @@ typedef struct {
 
 uint8_t acpi_calc_checksum(const uint8_t *data, int len);
 uint32_t acpi_find_rsdp_address(QTestState *qts);
-void acpi_fetch_rsdp_table(QTestState *qts, uint32_t addr, uint8_t *rsdp_table);
+void acpi_fetch_rsdp_table(QTestState *qts, uint64_t addr, uint8_t *rsdp_table);
 void acpi_fetch_table(QTestState *qts, uint8_t **aml, uint32_t *aml_len,
                       const uint8_t *addr_ptr, int addr_size, const char *sig,
                       bool verify_checksum);
diff --git a/tests/bios-tables-test.c b/tests/bios-tables-test.c
index d6ab1218da..a164d274a2 100644
--- a/tests/bios-tables-test.c
+++ b/tests/bios-tables-test.c
@@ -26,7 +26,7 @@
 typedef struct {
     const char *machine;
     const char *variant;
-    uint32_t rsdp_addr;
+    uint64_t rsdp_addr;
     uint8_t rsdp_table[36 /* ACPI 2.0+ RSDP size */];
     GArray *tables;
     uint32_t smbios_ep_addr;
@@ -86,13 +86,11 @@ static void test_acpi_rsdp_address(test_data *data)
 
 static void test_acpi_rsdp_table(test_data *data)
 {
-    uint8_t *rsdp_table = data->rsdp_table, revision;
-    uint32_t addr = data->rsdp_addr;
+    uint8_t *rsdp_table = data->rsdp_table;
 
-    acpi_fetch_rsdp_table(data->qts, addr, rsdp_table);
-    revision = rsdp_table[15 /* Revision offset */];
+    acpi_fetch_rsdp_table(data->qts, data->rsdp_addr, rsdp_table);
 
-    switch (revision) {
+    switch (rsdp_table[15 /* Revision offset */]) {
     case 0: /* ACPI 1.0 RSDP */
         /* With rev 1, checksum is only for the first 20 bytes */
         g_assert(!acpi_calc_checksum(rsdp_table,  20));