diff --git a/internal/core/platform.rs b/internal/core/platform.rs
index a969901b8..a739c8302 100644
--- a/internal/core/platform.rs
+++ b/internal/core/platform.rs
@@ -74,21 +74,7 @@ pub trait Platform {
     /// should direct the output to some developer visible terminal. The default implementation
     /// uses stderr if available, or `console.log` when targeting wasm.
     fn debug_log(&self, _arguments: core::fmt::Arguments) {
-        cfg_if::cfg_if! {
-            if #[cfg(target_arch = "wasm32")] {
-                use wasm_bindgen::prelude::*;
-
-                #[wasm_bindgen]
-                extern "C" {
-                    #[wasm_bindgen(js_namespace = console)]
-                    pub fn log(s: &str);
-                }
-
-                log(&_arguments.to_string());
-            } else if #[cfg(feature = "std")] {
-                eprintln!("{}", _arguments);
-            }
-        }
+        crate::tests::default_debug_log(_arguments);
     }
 }
 
diff --git a/internal/core/tests.rs b/internal/core/tests.rs
index ae7a80aee..fba343edf 100644
--- a/internal/core/tests.rs
+++ b/internal/core/tests.rs
@@ -88,7 +88,29 @@ pub extern "C" fn send_keyboard_string_sequence(
 /// implementation details for debug_log()
 #[doc(hidden)]
 pub fn debug_log_impl(args: core::fmt::Arguments) {
-    crate::platform::PLATFORM_INSTANCE.with(|p| p.get().map(|p| p.debug_log(args)));
+    crate::platform::PLATFORM_INSTANCE.with(|p| match p.get() {
+        Some(platform) => platform.debug_log(args),
+        None => default_debug_log(args),
+    });
+}
+
+#[doc(hidden)]
+pub fn default_debug_log(_arguments: core::fmt::Arguments) {
+    cfg_if::cfg_if! {
+        if #[cfg(target_arch = "wasm32")] {
+            use wasm_bindgen::prelude::*;
+
+            #[wasm_bindgen]
+            extern "C" {
+                #[wasm_bindgen(js_namespace = console)]
+                pub fn log(s: &str);
+            }
+
+            log(&_arguments.to_string());
+        } else if #[cfg(feature = "std")] {
+            eprintln!("{}", _arguments);
+        }
+    }
 }
 
 #[macro_export]
diff --git a/tools/lsp/Cargo.toml b/tools/lsp/Cargo.toml
index 29a2c5c82..78c81e5a2 100644
--- a/tools/lsp/Cargo.toml
+++ b/tools/lsp/Cargo.toml
@@ -49,7 +49,7 @@ backend-gl-all = ["backend-winit", "renderer-winit-femtovg"]
 backend-gl-wayland = ["backend-winit-wayland", "renderer-winit-femtovg"]
 backend-gl-x11 = ["backend-winit-x11", "renderer-winit-femtovg"]
 
-preview = ["slint-interpreter", "i-slint-backend-selector"]
+preview = ["slint-interpreter", "i-slint-core", "i-slint-backend-selector"]
 
 default = ["backend-qt", "backend-winit", "renderer-winit-femtovg", "preview"]
 
@@ -60,10 +60,10 @@ euclid = "0.22"
 lsp-types = { version = "0.93.0", features = ["proposed"] }
 serde = "1.0.118"
 serde_json = "1.0.60"
-i-slint-core = { version = "=0.3.1", path = "../../internal/core" }
 
 
 # for the preview
+i-slint-core = { version = "=0.3.1", path = "../../internal/core", optional = true }
 slint-interpreter = { version = "=0.3.1", path = "../../internal/interpreter", default-features = false, features = ["compat-0-3-0"], optional = true  }
 i-slint-backend-selector = { version = "=0.3.1", path="../../internal/backends/selector", optional = true }
 
diff --git a/tools/lsp/wasm_main.rs b/tools/lsp/wasm_main.rs
index 5c7ebc49d..d23389139 100644
--- a/tools/lsp/wasm_main.rs
+++ b/tools/lsp/wasm_main.rs
@@ -12,8 +12,6 @@ mod server_loop;
 mod util;
 
 use i_slint_compiler::CompilerConfiguration;
-#[cfg(not(feature = "preview"))]
-use i_slint_core::window::WindowAdapter;
 use js_sys::Function;
 use lsp_types::InitializeParams;
 use serde::Serialize;
@@ -145,11 +143,6 @@ pub fn create(
 ) -> Result<SlintServer, JsError> {
     console_error_panic_hook::set_once();
 
-    // make sure the backend is initialized for logging
-    #[cfg(not(feature = "preview"))]
-    i_slint_core::platform::set_platform(Box::new(DummyBackend {}))
-        .expect("platform already initialized");
-
     let init_param = init_param.into_serde()?;
 
     let mut compiler_config =
@@ -239,13 +232,3 @@ async fn load_file(path: String, load_file: &Function) -> std::io::Result<String
     String::from_utf8(js_sys::Uint8Array::from(array).to_vec())
         .map_err(|e| std::io::Error::new(ErrorKind::InvalidData, e.to_string()))
 }
-
-#[cfg(not(feature = "preview"))]
-struct DummyBackend {}
-
-#[cfg(not(feature = "preview"))]
-impl i_slint_core::platform::Platform for DummyBackend {
-    fn create_window_adapter(&self) -> Rc<dyn WindowAdapter> {
-        unimplemented!()
-    }
-}