diff --git a/src/qemu/qemu_capabilities.c b/src/qemu/qemu_capabilities.c
index 3f5ddbd34e..dab3665f07 100644
--- a/src/qemu/qemu_capabilities.c
+++ b/src/qemu/qemu_capabilities.c
@@ -585,6 +585,7 @@ VIR_ENUM_IMPL(virQEMUCaps,
 
               /* 370 */
               "cpu.migratable",
+              "query-cpu-model-expansion.migratable",
     );
 
 
@@ -5041,9 +5042,18 @@ virQEMUCapsInitProcessCaps(virQEMUCapsPtr qemuCaps)
         virQEMUCapsClear(qemuCaps, QEMU_CAPS_DEVICE_NVDIMM);
 
     if (ARCH_IS_X86(qemuCaps->arch) &&
-        virQEMUCapsGet(qemuCaps, QEMU_CAPS_QUERY_CPU_MODEL_EXPANSION))
+        virQEMUCapsGet(qemuCaps, QEMU_CAPS_QUERY_CPU_MODEL_EXPANSION)) {
         virQEMUCapsSet(qemuCaps, QEMU_CAPS_CPU_CACHE);
 
+        /* Old x86 QEMU supported migratable:false property in
+         * query-cpu-model-expansion arguments even though it was not properly
+         * advertised as a CPU property.
+         */
+        if (virQEMUCapsGet(qemuCaps, QEMU_CAPS_CPU_MIGRATABLE) ||
+            qemuCaps->version < 2012000)
+            virQEMUCapsSet(qemuCaps, QEMU_CAPS_QUERY_CPU_MODEL_EXPANSION_MIGRATABLE);
+    }
+
     if (ARCH_IS_S390(qemuCaps->arch)) {
         /* Legacy assurance for QEMU_CAPS_CCW */
         if (!virQEMUCapsGet(qemuCaps, QEMU_CAPS_CCW) &&
diff --git a/src/qemu/qemu_capabilities.h b/src/qemu/qemu_capabilities.h
index c07b3e6f08..f085e67e11 100644
--- a/src/qemu/qemu_capabilities.h
+++ b/src/qemu/qemu_capabilities.h
@@ -566,6 +566,7 @@ typedef enum { /* virQEMUCapsFlags grouping marker for syntax-check */
 
     /* 370 */
     QEMU_CAPS_CPU_MIGRATABLE, /* -cpu ...,migratable=on|off */
+    QEMU_CAPS_QUERY_CPU_MODEL_EXPANSION_MIGRATABLE, /* query-cpu-model-expansion supports migratable:false */
 
     QEMU_CAPS_LAST /* this must always be the last item */
 } virQEMUCapsFlags;
diff --git a/tests/qemucapabilitiesdata/caps_2.10.0.x86_64.xml b/tests/qemucapabilitiesdata/caps_2.10.0.x86_64.xml
index cb02723ada..8030de8b5f 100644
--- a/tests/qemucapabilitiesdata/caps_2.10.0.x86_64.xml
+++ b/tests/qemucapabilitiesdata/caps_2.10.0.x86_64.xml
@@ -185,6 +185,7 @@
   <flag name='i8042'/>
   <flag name='tcg'/>
   <flag name='pvscsi'/>
+  <flag name='query-cpu-model-expansion.migratable'/>
   <version>2010000</version>
   <kvmVersion>0</kvmVersion>
   <microcodeVersion>43100287</microcodeVersion>
diff --git a/tests/qemucapabilitiesdata/caps_2.11.0.x86_64.xml b/tests/qemucapabilitiesdata/caps_2.11.0.x86_64.xml
index 5245fc77dc..cf927c0bd6 100644
--- a/tests/qemucapabilitiesdata/caps_2.11.0.x86_64.xml
+++ b/tests/qemucapabilitiesdata/caps_2.11.0.x86_64.xml
@@ -191,6 +191,7 @@
   <flag name='i8042'/>
   <flag name='tcg'/>
   <flag name='pvscsi'/>
+  <flag name='query-cpu-model-expansion.migratable'/>
   <version>2011000</version>
   <kvmVersion>0</kvmVersion>
   <microcodeVersion>43100288</microcodeVersion>
diff --git a/tests/qemucapabilitiesdata/caps_2.12.0.x86_64.xml b/tests/qemucapabilitiesdata/caps_2.12.0.x86_64.xml
index 1cb0957ed7..d9de98eca4 100644
--- a/tests/qemucapabilitiesdata/caps_2.12.0.x86_64.xml
+++ b/tests/qemucapabilitiesdata/caps_2.12.0.x86_64.xml
@@ -201,6 +201,7 @@
   <flag name='tcg'/>
   <flag name='pvscsi'/>
   <flag name='cpu.migratable'/>
+  <flag name='query-cpu-model-expansion.migratable'/>
   <version>2011090</version>
   <kvmVersion>0</kvmVersion>
   <microcodeVersion>43100289</microcodeVersion>
diff --git a/tests/qemucapabilitiesdata/caps_2.9.0.x86_64.xml b/tests/qemucapabilitiesdata/caps_2.9.0.x86_64.xml
index 122d9509f1..866d1062bf 100644
--- a/tests/qemucapabilitiesdata/caps_2.9.0.x86_64.xml
+++ b/tests/qemucapabilitiesdata/caps_2.9.0.x86_64.xml
@@ -179,6 +179,7 @@
   <flag name='i8042'/>
   <flag name='tcg'/>
   <flag name='pvscsi'/>
+  <flag name='query-cpu-model-expansion.migratable'/>
   <version>2009000</version>
   <kvmVersion>0</kvmVersion>
   <microcodeVersion>43100247</microcodeVersion>
diff --git a/tests/qemucapabilitiesdata/caps_3.0.0.x86_64.xml b/tests/qemucapabilitiesdata/caps_3.0.0.x86_64.xml
index 10b2661fe3..ac8db37399 100644
--- a/tests/qemucapabilitiesdata/caps_3.0.0.x86_64.xml
+++ b/tests/qemucapabilitiesdata/caps_3.0.0.x86_64.xml
@@ -207,6 +207,7 @@
   <flag name='tcg'/>
   <flag name='pvscsi'/>
   <flag name='cpu.migratable'/>
+  <flag name='query-cpu-model-expansion.migratable'/>
   <version>3000000</version>
   <kvmVersion>0</kvmVersion>
   <microcodeVersion>43100239</microcodeVersion>
diff --git a/tests/qemucapabilitiesdata/caps_3.1.0.x86_64.xml b/tests/qemucapabilitiesdata/caps_3.1.0.x86_64.xml
index 7ff47aa348..bc013ecc08 100644
--- a/tests/qemucapabilitiesdata/caps_3.1.0.x86_64.xml
+++ b/tests/qemucapabilitiesdata/caps_3.1.0.x86_64.xml
@@ -210,6 +210,7 @@
   <flag name='tcg'/>
   <flag name='pvscsi'/>
   <flag name='cpu.migratable'/>
+  <flag name='query-cpu-model-expansion.migratable'/>
   <version>3000092</version>
   <kvmVersion>0</kvmVersion>
   <microcodeVersion>43100240</microcodeVersion>
diff --git a/tests/qemucapabilitiesdata/caps_4.0.0.x86_64.xml b/tests/qemucapabilitiesdata/caps_4.0.0.x86_64.xml
index e9fdf9cb1e..d7fb3c2a14 100644
--- a/tests/qemucapabilitiesdata/caps_4.0.0.x86_64.xml
+++ b/tests/qemucapabilitiesdata/caps_4.0.0.x86_64.xml
@@ -215,6 +215,7 @@
   <flag name='tcg'/>
   <flag name='pvscsi'/>
   <flag name='cpu.migratable'/>
+  <flag name='query-cpu-model-expansion.migratable'/>
   <version>4000000</version>
   <kvmVersion>0</kvmVersion>
   <microcodeVersion>43100240</microcodeVersion>
diff --git a/tests/qemucapabilitiesdata/caps_4.1.0.x86_64.xml b/tests/qemucapabilitiesdata/caps_4.1.0.x86_64.xml
index d57cedd0db..6f904b6ff4 100644
--- a/tests/qemucapabilitiesdata/caps_4.1.0.x86_64.xml
+++ b/tests/qemucapabilitiesdata/caps_4.1.0.x86_64.xml
@@ -221,6 +221,7 @@
   <flag name='tcg'/>
   <flag name='pvscsi'/>
   <flag name='cpu.migratable'/>
+  <flag name='query-cpu-model-expansion.migratable'/>
   <version>4001000</version>
   <kvmVersion>0</kvmVersion>
   <microcodeVersion>43100241</microcodeVersion>
diff --git a/tests/qemucapabilitiesdata/caps_4.2.0.x86_64.xml b/tests/qemucapabilitiesdata/caps_4.2.0.x86_64.xml
index 2685c3219f..f0bb23d507 100644
--- a/tests/qemucapabilitiesdata/caps_4.2.0.x86_64.xml
+++ b/tests/qemucapabilitiesdata/caps_4.2.0.x86_64.xml
@@ -229,6 +229,7 @@
   <flag name='tcg'/>
   <flag name='pvscsi'/>
   <flag name='cpu.migratable'/>
+  <flag name='query-cpu-model-expansion.migratable'/>
   <version>4002000</version>
   <kvmVersion>0</kvmVersion>
   <microcodeVersion>43100242</microcodeVersion>
diff --git a/tests/qemucapabilitiesdata/caps_5.0.0.x86_64.xml b/tests/qemucapabilitiesdata/caps_5.0.0.x86_64.xml
index 0355518cbe..e4bf738cb5 100644
--- a/tests/qemucapabilitiesdata/caps_5.0.0.x86_64.xml
+++ b/tests/qemucapabilitiesdata/caps_5.0.0.x86_64.xml
@@ -235,6 +235,7 @@
   <flag name='virtio-blk-pci.scsi.default.disabled'/>
   <flag name='pvscsi'/>
   <flag name='cpu.migratable'/>
+  <flag name='query-cpu-model-expansion.migratable'/>
   <version>5000000</version>
   <kvmVersion>0</kvmVersion>
   <microcodeVersion>43100241</microcodeVersion>
diff --git a/tests/qemucapabilitiesdata/caps_5.1.0.x86_64.xml b/tests/qemucapabilitiesdata/caps_5.1.0.x86_64.xml
index 906fec41ee..cec503308f 100644
--- a/tests/qemucapabilitiesdata/caps_5.1.0.x86_64.xml
+++ b/tests/qemucapabilitiesdata/caps_5.1.0.x86_64.xml
@@ -235,6 +235,7 @@
   <flag name='virtio-blk-pci.scsi.default.disabled'/>
   <flag name='pvscsi'/>
   <flag name='cpu.migratable'/>
+  <flag name='query-cpu-model-expansion.migratable'/>
   <version>5000050</version>
   <kvmVersion>0</kvmVersion>
   <microcodeVersion>43100242</microcodeVersion>