diff --git a/src/qemu/qemu_capabilities.c b/src/qemu/qemu_capabilities.c
index 51bf97b039..d4fac18337 100644
--- a/src/qemu/qemu_capabilities.c
+++ b/src/qemu/qemu_capabilities.c
@@ -514,7 +514,8 @@ VIR_ENUM_IMPL(virQEMUCaps, QEMU_CAPS_LAST,
               "memory-backend-memfd.hugetlb",
               "iothread.poll-max-ns",
               "machine.pseries.cap-nested-hv",
-              "egl-headless.rendernode"
+              "egl-headless.rendernode",
+              "memory-backend-file.align",
     );
 
 
@@ -1365,6 +1366,7 @@ static virQEMUCapsObjectTypeProps virQEMUCapsDeviceProps[] = {
 
 static struct virQEMUCapsStringFlags virQEMUCapsObjectPropsMemoryBackendFile[] = {
     { "discard-data", QEMU_CAPS_OBJECT_MEMORY_FILE_DISCARD },
+    { "align", QEMU_CAPS_OBJECT_MEMORY_FILE_ALIGN },
 };
 
 static struct virQEMUCapsStringFlags virQEMUCapsObjectPropsMemoryBackendMemfd[] = {
diff --git a/src/qemu/qemu_capabilities.h b/src/qemu/qemu_capabilities.h
index 1ed7639513..9df4a873ff 100644
--- a/src/qemu/qemu_capabilities.h
+++ b/src/qemu/qemu_capabilities.h
@@ -499,6 +499,7 @@ typedef enum { /* virQEMUCapsFlags grouping marker for syntax-check */
     QEMU_CAPS_IOTHREAD_POLLING, /* -object iothread.poll-max-ns */
     QEMU_CAPS_MACHINE_PSERIES_CAP_NESTED_HV, /* -machine pseries.cap-nested-hv */
     QEMU_CAPS_EGL_HEADLESS_RENDERNODE, /* -display egl-headless,rendernode= */
+    QEMU_CAPS_OBJECT_MEMORY_FILE_ALIGN, /* -object memory-backend-file,align= */
 
     QEMU_CAPS_LAST /* this must always be the last item */
 } virQEMUCapsFlags;
diff --git a/tests/qemucapabilitiesdata/caps_2.12.0.aarch64.xml b/tests/qemucapabilitiesdata/caps_2.12.0.aarch64.xml
index 8dd90f5e72..186a6ccfeb 100644
--- a/tests/qemucapabilitiesdata/caps_2.12.0.aarch64.xml
+++ b/tests/qemucapabilitiesdata/caps_2.12.0.aarch64.xml
@@ -165,6 +165,7 @@
   <flag name='memory-backend-memfd'/>
   <flag name='memory-backend-memfd.hugetlb'/>
   <flag name='iothread.poll-max-ns'/>
+  <flag name='memory-backend-file.align'/>
   <version>2011090</version>
   <kvmVersion>0</kvmVersion>
   <microcodeVersion>345725</microcodeVersion>
diff --git a/tests/qemucapabilitiesdata/caps_2.12.0.ppc64.xml b/tests/qemucapabilitiesdata/caps_2.12.0.ppc64.xml
index e64610340f..c47ebd77ad 100644
--- a/tests/qemucapabilitiesdata/caps_2.12.0.ppc64.xml
+++ b/tests/qemucapabilitiesdata/caps_2.12.0.ppc64.xml
@@ -163,6 +163,7 @@
   <flag name='memory-backend-memfd'/>
   <flag name='memory-backend-memfd.hugetlb'/>
   <flag name='iothread.poll-max-ns'/>
+  <flag name='memory-backend-file.align'/>
   <version>2011090</version>
   <kvmVersion>0</kvmVersion>
   <microcodeVersion>426509</microcodeVersion>
diff --git a/tests/qemucapabilitiesdata/caps_2.12.0.s390x.xml b/tests/qemucapabilitiesdata/caps_2.12.0.s390x.xml
index b18bd74dee..49249f5adf 100644
--- a/tests/qemucapabilitiesdata/caps_2.12.0.s390x.xml
+++ b/tests/qemucapabilitiesdata/caps_2.12.0.s390x.xml
@@ -132,6 +132,7 @@
   <flag name='memory-backend-memfd'/>
   <flag name='memory-backend-memfd.hugetlb'/>
   <flag name='iothread.poll-max-ns'/>
+  <flag name='memory-backend-file.align'/>
   <version>2012000</version>
   <kvmVersion>0</kvmVersion>
   <microcodeVersion>375102</microcodeVersion>
diff --git a/tests/qemucapabilitiesdata/caps_2.12.0.x86_64.xml b/tests/qemucapabilitiesdata/caps_2.12.0.x86_64.xml
index ac97e168f1..54c4a65e57 100644
--- a/tests/qemucapabilitiesdata/caps_2.12.0.x86_64.xml
+++ b/tests/qemucapabilitiesdata/caps_2.12.0.x86_64.xml
@@ -206,6 +206,7 @@
   <flag name='memory-backend-memfd'/>
   <flag name='memory-backend-memfd.hugetlb'/>
   <flag name='iothread.poll-max-ns'/>
+  <flag name='memory-backend-file.align'/>
   <version>2011090</version>
   <kvmVersion>0</kvmVersion>
   <microcodeVersion>414371</microcodeVersion>
diff --git a/tests/qemucapabilitiesdata/caps_3.0.0.ppc64.xml b/tests/qemucapabilitiesdata/caps_3.0.0.ppc64.xml
index f11d860efb..24a3c2b716 100644
--- a/tests/qemucapabilitiesdata/caps_3.0.0.ppc64.xml
+++ b/tests/qemucapabilitiesdata/caps_3.0.0.ppc64.xml
@@ -163,6 +163,7 @@
   <flag name='memory-backend-memfd'/>
   <flag name='memory-backend-memfd.hugetlb'/>
   <flag name='iothread.poll-max-ns'/>
+  <flag name='memory-backend-file.align'/>
   <version>2012050</version>
   <kvmVersion>0</kvmVersion>
   <microcodeVersion>444946</microcodeVersion>
diff --git a/tests/qemucapabilitiesdata/caps_3.0.0.riscv32.xml b/tests/qemucapabilitiesdata/caps_3.0.0.riscv32.xml
index 552b319791..1b5d8e6e12 100644
--- a/tests/qemucapabilitiesdata/caps_3.0.0.riscv32.xml
+++ b/tests/qemucapabilitiesdata/caps_3.0.0.riscv32.xml
@@ -103,6 +103,7 @@
   <flag name='memory-backend-memfd'/>
   <flag name='memory-backend-memfd.hugetlb'/>
   <flag name='iothread.poll-max-ns'/>
+  <flag name='memory-backend-file.align'/>
   <version>3000000</version>
   <kvmVersion>0</kvmVersion>
   <microcodeVersion>0</microcodeVersion>
diff --git a/tests/qemucapabilitiesdata/caps_3.0.0.riscv64.xml b/tests/qemucapabilitiesdata/caps_3.0.0.riscv64.xml
index 4f9832dc09..3c76f6355d 100644
--- a/tests/qemucapabilitiesdata/caps_3.0.0.riscv64.xml
+++ b/tests/qemucapabilitiesdata/caps_3.0.0.riscv64.xml
@@ -103,6 +103,7 @@
   <flag name='memory-backend-memfd'/>
   <flag name='memory-backend-memfd.hugetlb'/>
   <flag name='iothread.poll-max-ns'/>
+  <flag name='memory-backend-file.align'/>
   <version>3000000</version>
   <kvmVersion>0</kvmVersion>
   <microcodeVersion>0</microcodeVersion>
diff --git a/tests/qemucapabilitiesdata/caps_3.0.0.s390x.xml b/tests/qemucapabilitiesdata/caps_3.0.0.s390x.xml
index 1c4177c9f4..8569de6538 100644
--- a/tests/qemucapabilitiesdata/caps_3.0.0.s390x.xml
+++ b/tests/qemucapabilitiesdata/caps_3.0.0.s390x.xml
@@ -134,6 +134,7 @@
   <flag name='memory-backend-memfd'/>
   <flag name='memory-backend-memfd.hugetlb'/>
   <flag name='iothread.poll-max-ns'/>
+  <flag name='memory-backend-file.align'/>
   <version>3000000</version>
   <kvmVersion>0</kvmVersion>
   <microcodeVersion>388416</microcodeVersion>
diff --git a/tests/qemucapabilitiesdata/caps_3.0.0.x86_64.xml b/tests/qemucapabilitiesdata/caps_3.0.0.x86_64.xml
index b2d98a6afa..15df8a5bba 100644
--- a/tests/qemucapabilitiesdata/caps_3.0.0.x86_64.xml
+++ b/tests/qemucapabilitiesdata/caps_3.0.0.x86_64.xml
@@ -208,6 +208,7 @@
   <flag name='memory-backend-memfd'/>
   <flag name='memory-backend-memfd.hugetlb'/>
   <flag name='iothread.poll-max-ns'/>
+  <flag name='memory-backend-file.align'/>
   <version>3000000</version>
   <kvmVersion>0</kvmVersion>
   <microcodeVersion>425972</microcodeVersion>
diff --git a/tests/qemucapabilitiesdata/caps_3.1.0.ppc64.xml b/tests/qemucapabilitiesdata/caps_3.1.0.ppc64.xml
index b06b17316a..48f4fdfcee 100644
--- a/tests/qemucapabilitiesdata/caps_3.1.0.ppc64.xml
+++ b/tests/qemucapabilitiesdata/caps_3.1.0.ppc64.xml
@@ -166,6 +166,7 @@
   <flag name='memory-backend-memfd.hugetlb'/>
   <flag name='iothread.poll-max-ns'/>
   <flag name='machine.pseries.cap-nested-hv'/>
+  <flag name='memory-backend-file.align'/>
   <version>3000091</version>
   <kvmVersion>0</kvmVersion>
   <microcodeVersion>437731</microcodeVersion>
diff --git a/tests/qemucapabilitiesdata/caps_3.1.0.x86_64.xml b/tests/qemucapabilitiesdata/caps_3.1.0.x86_64.xml
index 6c9c0c6612..6be80ce2db 100644
--- a/tests/qemucapabilitiesdata/caps_3.1.0.x86_64.xml
+++ b/tests/qemucapabilitiesdata/caps_3.1.0.x86_64.xml
@@ -209,6 +209,7 @@
   <flag name='memory-backend-memfd.hugetlb'/>
   <flag name='iothread.poll-max-ns'/>
   <flag name='egl-headless.rendernode'/>
+  <flag name='memory-backend-file.align'/>
   <version>3000092</version>
   <kvmVersion>0</kvmVersion>
   <microcodeVersion>440395</microcodeVersion>