diff --git a/bin/propolis-server/src/lib/initializer.rs b/bin/propolis-server/src/lib/initializer.rs
index 1f4c08081..2b0494805 100644
--- a/bin/propolis-server/src/lib/initializer.rs
+++ b/bin/propolis-server/src/lib/initializer.rs
@@ -282,7 +282,7 @@ impl<'a> MachineInitializer<'a> {
         uuid: uuid::Uuid,
     ) -> Result<(), anyhow::Error> {
         if let Some(ref spec) = self.spec.devices.qemu_pvpanic {
-            if spec.enable_isa {
+            if spec.enable_mmio {
                 let pvpanic = QemuPvpanic::create(
                     self.log.new(slog::o!("dev" => "qemu-pvpanic")),
                 );
diff --git a/bin/propolis-server/src/lib/stats/pvpanic.rs b/bin/propolis-server/src/lib/stats/pvpanic.rs
index 83df2aca5..53d24a717 100644
--- a/bin/propolis-server/src/lib/stats/pvpanic.rs
+++ b/bin/propolis-server/src/lib/stats/pvpanic.rs
@@ -62,6 +62,7 @@ impl Producer for PvpanicProducer {
 
         self.host_handled_panics.datum_mut().set(host_handled as i64);
         self.guest_handled_panics.datum_mut().set(guest_handled as i64);
+
         let data = vec![
             Sample::new(&self.stat_name, &self.guest_handled_panics)?,
             Sample::new(&self.stat_name, &self.host_handled_panics)?,
diff --git a/bin/propolis-standalone/src/main.rs b/bin/propolis-standalone/src/main.rs
index ec58fbfba..7efef8dcb 100644
--- a/bin/propolis-standalone/src/main.rs
+++ b/bin/propolis-standalone/src/main.rs
@@ -931,12 +931,12 @@ fn setup_instance(
                 chipset.pci_attach(bdf, nvme);
             }
             qemu::pvpanic::DEVICE_NAME => {
-                let enable_isa = dev
+                let enable_mmio = dev
                     .options
-                    .get("enable_isa")
+                    .get("enable_mmio")
                     .and_then(|opt| opt.as_bool())
                     .unwrap_or(false);
-                if enable_isa {
+                if enable_mmio {
                     let pvpanic = QemuPvpanic::create(
                         log.new(slog::o!("dev" => "pvpanic")),
                     );
diff --git a/crates/propolis-api-types/src/instance_spec/components/devices.rs b/crates/propolis-api-types/src/instance_spec/components/devices.rs
index 7277de8aa..c91bc1e10 100644
--- a/crates/propolis-api-types/src/instance_spec/components/devices.rs
+++ b/crates/propolis-api-types/src/instance_spec/components/devices.rs
@@ -228,7 +228,7 @@ pub enum MigrationCompatibilityError {
 #[serde(deny_unknown_fields)]
 pub struct QemuPvpanic {
     /// Enable the QEMU PVPANIC ISA bus device (I/O port 0x505).
-    pub enable_isa: bool,
+    pub enable_mmio: bool,
     // TODO(eliza): add support for the PCI PVPANIC device...
 }
 
@@ -428,20 +428,20 @@ mod test {
 
     #[test]
     fn incompatible_qemu_pvpanic() {
-        let d1 = Some(QemuPvpanic { enable_isa: true });
-        let d2 = Some(QemuPvpanic { enable_isa: false });
+        let d1 = Some(QemuPvpanic { enable_mmio: true });
+        let d2 = Some(QemuPvpanic { enable_mmio: false });
         assert!(d1.can_migrate_from_element(&d2).is_err());
         assert!(d1.can_migrate_from_element(&None).is_err());
     }
 
     #[test]
     fn compatible_qemu_pvpanic() {
-        let d1 = Some(QemuPvpanic { enable_isa: true });
-        let d2 = Some(QemuPvpanic { enable_isa: true });
+        let d1 = Some(QemuPvpanic { enable_mmio: true });
+        let d2 = Some(QemuPvpanic { enable_mmio: true });
         assert!(d1.can_migrate_from_element(&d2).is_ok());
 
-        let d1 = Some(QemuPvpanic { enable_isa: false });
-        let d2 = Some(QemuPvpanic { enable_isa: false });
+        let d1 = Some(QemuPvpanic { enable_mmio: false });
+        let d2 = Some(QemuPvpanic { enable_mmio: false });
         assert!(d1.can_migrate_from_element(&d2).is_ok());
     }
 }
diff --git a/openapi/propolis-server.json b/openapi/propolis-server.json
index 80b4fc61c..f99792744 100644
--- a/openapi/propolis-server.json
+++ b/openapi/propolis-server.json
@@ -1351,13 +1351,13 @@
       "QemuPvpanic": {
         "type": "object",
         "properties": {
-          "enable_isa": {
+          "enable_mmio": {
             "description": "Enable the QEMU PVPANIC ISA bus device (I/O port 0x505).",
             "type": "boolean"
           }
         },
         "required": [
-          "enable_isa"
+          "enable_mmio"
         ],
         "additionalProperties": false
       },