diff --git a/example/complex.nix b/example/complex.nix
index 590dd9b..b361196 100644
--- a/example/complex.nix
+++ b/example/complex.nix
@@ -109,7 +109,7 @@
             type = "filesystem";
             format = "ext4";
             mountpoint = "/ext4_on_lvm";
-            options = [
+            mountOptions = [
               "defaults"
             ];
           };
diff --git a/example/luks-lvm.nix b/example/luks-lvm.nix
index af1c4a3..a6879ce 100644
--- a/example/luks-lvm.nix
+++ b/example/luks-lvm.nix
@@ -17,7 +17,7 @@
               type = "filesystem";
               format = "vfat";
               mountpoint = "/boot";
-              options = [
+              mountOptions = [
                 "defaults"
               ];
             };
@@ -52,7 +52,7 @@
             type = "filesystem";
             format = "ext4";
             mountpoint = "/";
-            options = [
+            mountOptions = [
               "defaults"
             ];
           };
diff --git a/example/lvm-raid.nix b/example/lvm-raid.nix
index 8622238..70ea197 100644
--- a/example/lvm-raid.nix
+++ b/example/lvm-raid.nix
@@ -89,7 +89,7 @@
             type = "filesystem";
             format = "ext4";
             mountpoint = "/";
-            options = [
+            mountOptions = [
               "defaults"
             ];
           };
diff --git a/example/zfs-over-legacy.nix b/example/zfs-over-legacy.nix
index 974af35..8e02b00 100644
--- a/example/zfs-over-legacy.nix
+++ b/example/zfs-over-legacy.nix
@@ -17,7 +17,7 @@
               type = "filesystem";
               format = "vfat";
               mountpoint = "/boot";
-              options = [
+              mountOptions = [
                 "defaults"
               ];
             };
diff --git a/types.nix b/types.nix
index a65f2c1..91cc7c1 100644
--- a/types.nix
+++ b/types.nix
@@ -266,7 +266,7 @@ rec {
       };
       mountOptions = mkOption {
         type = types.listOf types.str;
-        default = [];
+        default = [ "defaults" ];
       };
       _meta = mkOption {
         internal = true;
@@ -323,7 +323,7 @@ rec {
       };
       mountOptions = mkOption {
         type = types.listOf types.str;
-        default = [];
+        default = [ "defaults" ];
       };
       subvolumes = mkOption {
         type = types.listOf optionTypes.pathname;
@@ -376,6 +376,7 @@ rec {
           fileSystems.${config.mountpoint} = {
             device = dev;
             fsType = "btrfs";
+            options = config.mountOptions;
           };
         }];
       };
@@ -400,11 +401,7 @@ rec {
       };
       mountOptions = mkOption {
         type = types.listOf types.str;
-        default = [];
-      };
-      options = mkOption {
-        type = types.listOf types.str;
-        default = [];
+        default = [ "defaults" ];
       };
       mountpoint = mkOption {
         type = optionTypes.absolute-pathname;
@@ -450,6 +447,7 @@ rec {
           fileSystems.${config.mountpoint} = {
             device = dev;
             fsType = config.format;
+            options = config.mountOptions;
           };
         }];
       };
@@ -932,7 +930,7 @@ rec {
       };
       mountOptions = mkOption {
         type = types.listOf types.str;
-        default = [];
+        default = [ "defaults" ];
       };
       datasets = mkOption {
         type = types.attrsOf zfs_dataset;
@@ -990,7 +988,7 @@ rec {
             fileSystems.${config.mountpoint} = {
               device = config.name;
               fsType = "zfs";
-              options = lib.optional ((config.options.mountpoint or "") != "legacy") "zfsutil";
+              options = config.mountOptions ++ lib.optional ((config.options.mountpoint or "") != "legacy") "zfsutil";
             };
           })
         ];
@@ -1024,7 +1022,7 @@ rec {
       };
       mountOptions = mkOption {
         type = types.listOf types.str;
-        default = [];
+        default = [ "defaults" ];
       };
 
       # filesystem options
@@ -1086,7 +1084,7 @@ rec {
             fileSystems.${config.mountpoint} = {
               device = "${zpool}/${config.name}";
               fsType = "zfs";
-              options = lib.optional ((config.options.mountpoint or "") != "legacy") "zfsutil";
+              options = config.mountOptions ++ lib.optional ((config.options.mountpoint or "") != "legacy") "zfsutil";
             };
           });
       };