diff --git a/changelogs/fragments/346-boot-linux.yml b/changelogs/fragments/346-boot-linux.yml
new file mode 100644
index 0000000..c0a2ae5
--- /dev/null
+++ b/changelogs/fragments/346-boot-linux.yml
@@ -0,0 +1,3 @@
+---
+bugfix:
+  - mount - Handle ``boot`` option on Linux, NetBSD and OpenBSD correctly (https://github.com/ansible-collections/ansible.posix/issues/364).
diff --git a/plugins/modules/mount.py b/plugins/modules/mount.py
index 144f46e..b17c0a9 100644
--- a/plugins/modules/mount.py
+++ b/plugins/modules/mount.py
@@ -840,11 +840,8 @@ def main():
             args['warnings'].append("Ignore the 'boot' due to 'opts' contains 'noauto'.")
         elif not module.params['boot']:
             args['boot'] = 'no'
-            if 'defaults' in opts:
-                args['warnings'].append("Ignore the 'boot' due to 'opts' contains 'defaults'.")
-            else:
-                opts.append('noauto')
-                args['opts'] = ','.join(opts)
+            opts.append('noauto')
+            args['opts'] = ','.join(opts)
 
     # If fstab file does not exist, we first need to create it. This mainly
     # happens when fstab option is passed to the module.
diff --git a/tests/integration/targets/mount/tasks/main.yml b/tests/integration/targets/mount/tasks/main.yml
index 58eace8..25d0ca0 100644
--- a/tests/integration/targets/mount/tasks/main.yml
+++ b/tests/integration/targets/mount/tasks/main.yml
@@ -467,6 +467,25 @@
         that:
           - mount_info['opts'] == 'rw,user,async,noauto'
 
+    - name: Unmount FS
+      ansible.posix.mount:
+        path: /tmp/myfs
+        state: absent
+        
+    - name: Mount the FS with noauto option and defaults
+      ansible.posix.mount:
+        path: /tmp/myfs
+        src: /tmp/myfs.img
+        fstype: ext3
+        state: mounted
+        boot: no
+      register: mount_info
+
+    - name: Assert the mount without noauto was successful
+      ansible.builtin.assert:
+        that:
+        - "'noauto' in mount_info['opts'].split(',')"
+
     - name: Unmount FS
       ansible.posix.mount:
         path: /tmp/myfs