diff --git a/.promu.yml b/.promu.yml
index 0e1747a62b..550336cf2d 100644
--- a/.promu.yml
+++ b/.promu.yml
@@ -32,6 +32,7 @@ tarball:
         - npm_licenses.tar.bz2
 crossbuild:
     platforms:
+        - aix
         - darwin
         - dragonfly
         - freebsd
diff --git a/go.mod b/go.mod
index 04b0682e7b..16faacaa76 100644
--- a/go.mod
+++ b/go.mod
@@ -27,7 +27,7 @@ require (
 	github.com/dennwc/varint v1.0.0
 	github.com/digitalocean/godo v1.175.0
 	github.com/docker/docker v28.5.2+incompatible
-	github.com/edsrzf/mmap-go v1.2.0
+	github.com/edsrzf/mmap-go v1.2.1-0.20241212181136-fad1cd13edbd
 	github.com/envoyproxy/go-control-plane/envoy v1.37.0
 	github.com/envoyproxy/protoc-gen-validate v1.3.3
 	github.com/facette/natsort v0.0.0-20181210072756-2cd4dd1e2dcb
diff --git a/go.sum b/go.sum
index 7140d35b42..46e20b3bd5 100644
--- a/go.sum
+++ b/go.sum
@@ -145,8 +145,8 @@ github.com/docker/go-connections v0.6.0 h1:LlMG9azAe1TqfR7sO+NJttz1gy6KO7VJBh+pM
 github.com/docker/go-connections v0.6.0/go.mod h1:AahvXYshr6JgfUJGdDCs2b5EZG/vmaMAntpSFH5BFKE=
 github.com/docker/go-units v0.5.0 h1:69rxXcBk27SvSaaxTtLh/8llcHD8vYHT7WSdRZ/jvr4=
 github.com/docker/go-units v0.5.0/go.mod h1:fgPhTUdO+D/Jk86RDLlptpiXQzgHJF7gydDDbaIK4Dk=
-github.com/edsrzf/mmap-go v1.2.0 h1:hXLYlkbaPzt1SaQk+anYwKSRNhufIDCchSPkUD6dD84=
-github.com/edsrzf/mmap-go v1.2.0/go.mod h1:19H/e8pUPLicwkyNgOykDXkJ9F0MHE+Z52B8EIth78Q=
+github.com/edsrzf/mmap-go v1.2.1-0.20241212181136-fad1cd13edbd h1:I4PrRZuNMeDP3VbFrak4QsqwO5tWkQf0tqrrr1L2DsU=
+github.com/edsrzf/mmap-go v1.2.1-0.20241212181136-fad1cd13edbd/go.mod h1:19H/e8pUPLicwkyNgOykDXkJ9F0MHE+Z52B8EIth78Q=
 github.com/emicklei/go-restful/v3 v3.12.2 h1:DhwDP0vY3k8ZzE0RunuJy8GhNpPL6zqLkDf9B/a0/xU=
 github.com/emicklei/go-restful/v3 v3.12.2/go.mod h1:6n3XBCmQQb25CM2LCACGz8ukIrRry+4bhvbpWn3mrbc=
 github.com/envoyproxy/go-control-plane/envoy v1.37.0 h1:u3riX6BoYRfF4Dr7dwSOroNfdSbEPe9Yyl09/B6wBrQ=
diff --git a/tsdb/fileutil/flock_aix.go b/tsdb/fileutil/flock_aix.go
new file mode 100644
index 0000000000..a463707325
--- /dev/null
+++ b/tsdb/fileutil/flock_aix.go
@@ -0,0 +1,59 @@
+// Copyright The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//go:build aix
+
+package fileutil
+
+import (
+	"os"
+	"syscall"
+)
+
+type unixLock struct {
+	f *os.File
+}
+
+func (l *unixLock) Release() error {
+	if err := l.set(false); err != nil {
+		return err
+	}
+	return l.f.Close()
+}
+
+func (l *unixLock) set(lock bool) error {
+	flock := syscall.Flock_t{
+		Type:   syscall.F_UNLCK,
+		Start:  0,
+		Len:    0,
+		Whence: 1,
+	}
+	if lock {
+		flock.Type = syscall.F_WRLCK
+	}
+	return syscall.FcntlFlock(l.f.Fd(), syscall.F_SETLK, &flock)
+}
+
+func newLock(fileName string) (Releaser, error) {
+	f, err := os.OpenFile(fileName, os.O_RDWR|os.O_CREATE, 0o666)
+	if err != nil {
+		return nil, err
+	}
+	l := &unixLock{f}
+	err = l.set(true)
+	if err != nil {
+		_ = f.Close()
+		return nil, err
+	}
+	return l, nil
+}