diff --git a/nixos/modules/services/web-apps/nextcloud.nix b/nixos/modules/services/web-apps/nextcloud.nix
index da019aa2507..1b643bd3260 100644
--- a/nixos/modules/services/web-apps/nextcloud.nix
+++ b/nixos/modules/services/web-apps/nextcloud.nix
@@ -6,17 +6,19 @@ let
   cfg = config.services.nextcloud;
   fpm = config.services.phpfpm.pools.nextcloud;
 
-  phpPackage =
-    let
-      base = pkgs.php74;
-    in
-      base.buildEnv {
-        extensions = { enabled, all }: with all;
-          enabled ++ [
-            apcu redis memcached imagick
-          ];
-        extraConfig = phpOptionsStr;
-      };
+  phpPackage = pkgs.php74.buildEnv {
+    extensions = { enabled, all }:
+      (with all;
+        enabled
+        ++ [ imagick ] # Always enabled
+        # Optionally enabled depending on caching settings
+        ++ optional cfg.caching.apcu apcu
+        ++ optional cfg.caching.redis redis
+        ++ optional cfg.caching.memcached memcached
+      )
+      ++ cfg.phpExtraExtensions all; # Enabled by user
+    extraConfig = toKeyValue phpOptions;
+  };
 
   toKeyValue = generators.toKeyValue {
     mkKeyValue = generators.mkKeyValueDefault {} " = ";
@@ -27,7 +29,6 @@ let
     post_max_size = cfg.maxUploadSize;
     memory_limit = cfg.maxUploadSize;
   } // cfg.phpOptions;
-  phpOptionsStr = toKeyValue phpOptions;
 
   occ = pkgs.writeScriptBin "nextcloud-occ" ''
     #! ${pkgs.runtimeShell}
@@ -116,6 +117,21 @@ in {
       '';
     };
 
+    phpExtraExtensions = mkOption {
+      type = with types; functionTo (listOf package);
+      default = all: [];
+      defaultText = "all: []";
+      description = ''
+        Additional PHP extensions to use for nextcloud.
+        By default, only extensions necessary for a vanilla nextcloud installation are enabled,
+        but you may choose from the list of available extensions and add further ones.
+        This is sometimes necessary to be able to install a certain nextcloud app that has additional requirements.
+      '';
+      example = literalExample ''
+        all: [ all.pdlib all.bz2 ]
+      '';
+    };
+
     phpOptions = mkOption {
       type = types.attrsOf types.str;
       default = {
@@ -511,7 +527,6 @@ in {
         pools.nextcloud = {
           user = "nextcloud";
           group = "nextcloud";
-          phpOptions = phpOptionsStr;
           phpPackage = phpPackage;
           phpEnv = {
             NEXTCLOUD_CONFIG_DIR = "${cfg.home}/config";
diff --git a/nixos/modules/services/web-apps/nextcloud.xml b/nixos/modules/services/web-apps/nextcloud.xml
index f71c8df6c6d..6cbfda118c4 100644
--- a/nixos/modules/services/web-apps/nextcloud.xml
+++ b/nixos/modules/services/web-apps/nextcloud.xml
@@ -182,6 +182,17 @@
   </para>
  </section>
 
+ <section xml:id="installing-apps-php-extensions-nextcloud">
+  <title>Installing Apps and PHP extensions</title>
+
+  <para>
+   Nextcloud apps are installed statefully through the web interface.
+
+   Some apps may require extra PHP extensions to be installed.
+   This can be configured with the <xref linkend="opt-services.nextcloud.phpExtraExtensions" /> setting.
+  </para>
+ </section>
+
  <section xml:id="module-services-nextcloud-maintainer-info">
   <title>Maintainer information</title>
 
diff --git a/nixos/tests/nextcloud/basic.nix b/nixos/tests/nextcloud/basic.nix
index 78142d37966..90050447042 100644
--- a/nixos/tests/nextcloud/basic.nix
+++ b/nixos/tests/nextcloud/basic.nix
@@ -42,6 +42,7 @@ in {
           enable = true;
           startAt = "20:00";
         };
+        phpExtraExtensions = all: [ all.bz2 ];
       };
 
       environment.systemPackages = [ cfg.services.nextcloud.occ ];