diff --git a/docs/content/en/docs/config/grpc/services/appprovider/_index.md b/docs/content/en/docs/config/grpc/services/appprovider/_index.md
index 559266a5f0..6bc4020f34 100644
--- a/docs/content/en/docs/config/grpc/services/appprovider/_index.md
+++ b/docs/content/en/docs/config/grpc/services/appprovider/_index.md
@@ -32,11 +32,11 @@ wopibridgeurl = ""
 {{< /highlight >}}
 {{% /dir %}}
 
-{{% dir name="mimetypes" type="map[string]string" default= %}}
+{{% dir name="mimetypes" type="map[string]string" default=nil %}}
 List of supported mime types and corresponding file extensions. [[Ref]](https://github.com/cs3org/reva/tree/master/internal/grpc/services/appprovider/appprovider.go#L62)
 {{< highlight toml >}}
 [grpc.services.appprovider]
-mimetypes = 
+mimetypes = nil
 {{< /highlight >}}
 {{% /dir %}}
 
diff --git a/internal/grpc/services/appprovider/appprovider.go b/internal/grpc/services/appprovider/appprovider.go
index 606002a013..7a2a55c393 100644
--- a/internal/grpc/services/appprovider/appprovider.go
+++ b/internal/grpc/services/appprovider/appprovider.go
@@ -59,7 +59,7 @@ type config struct {
 	IopSecret string                 `mapstructure:"iopsecret" docs:";The iopsecret used to connect to the wopiserver."`
 	WopiURL   string                 `mapstructure:"wopiurl" docs:";The wopiserver's URL."`
 	WopiBrURL string                 `mapstructure:"wopibridgeurl" docs:";The wopibridge's URL."`
-	MimeTypes map[string]string      `mapstructure:"mimetypes" docs:";List of supported mime types and corresponding file extensions."`
+	MimeTypes map[string]string      `mapstructure:"mimetypes" docs:"nil;List of supported mime types and corresponding file extensions."`
 }
 
 // New creates a new AppProviderService