diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c
index 01d988cfd3..badfa73fe4 100644
--- a/hw/i386/acpi-build.c
+++ b/hw/i386/acpi-build.c
@@ -145,7 +145,7 @@ static void acpi_get_dsdt(AcpiMiscInfo *info)
 
     /* Patch in appropriate value for AppleSMC _STA */
     *(uint8_t *)(info->dsdt_code + *applesmc_sta) =
-        applesmc_find() ? 0x0b : 0x00;
+        applesmc_port() ? 0x0b : 0x00;
 }
 
 static
diff --git a/hw/misc/applesmc.c b/hw/misc/applesmc.c
index 6a56b07c6b..6bd61e7828 100644
--- a/hw/misc/applesmc.c
+++ b/hw/misc/applesmc.c
@@ -43,7 +43,6 @@
 /* command/status port used by Apple SMC */
 #define APPLESMC_CMD_PORT              0x4
 #define APPLESMC_NR_PORTS              32
-#define APPLESMC_MAX_DATA_LENGTH       32
 
 #define APPLESMC_READ_CMD              0x10
 #define APPLESMC_WRITE_CMD             0x11
@@ -249,8 +248,8 @@ static void applesmc_isa_realize(DeviceState *dev, Error **errp)
 }
 
 static Property applesmc_isa_properties[] = {
-    DEFINE_PROP_UINT32("iobase", AppleSMCState, iobase,
-                      APPLESMC_DEFAULT_IOBASE),
+    DEFINE_PROP_UINT32(APPLESMC_PROP_IO_BASE, AppleSMCState, iobase,
+                       APPLESMC_DEFAULT_IOBASE),
     DEFINE_PROP_STRING("osk", AppleSMCState, osk),
     DEFINE_PROP_END_OF_LIST(),
 };
diff --git a/include/hw/isa/isa.h b/include/hw/isa/isa.h
index cf7bd343c7..f21ceaafc6 100644
--- a/include/hw/isa/isa.h
+++ b/include/hw/isa/isa.h
@@ -21,10 +21,17 @@
 #define ISA_BUS(obj) OBJECT_CHECK(ISABus, (obj), TYPE_ISA_BUS)
 
 #define TYPE_APPLE_SMC "isa-applesmc"
+#define APPLESMC_MAX_DATA_LENGTH       32
+#define APPLESMC_PROP_IO_BASE "iobase"
 
-static inline bool applesmc_find(void)
+static inline uint16_t applesmc_port(void)
 {
-    return object_resolve_path_type("", TYPE_APPLE_SMC, NULL);
+    Object *obj = object_resolve_path_type("", TYPE_APPLE_SMC, NULL);
+
+    if (obj) {
+        return object_property_get_int(obj, APPLESMC_PROP_IO_BASE, NULL);
+    }
+    return 0;
 }
 
 typedef struct ISADeviceClass {