diff --git a/src/plugins/platforms/wasm/qwasmcompositor.cpp b/src/plugins/platforms/wasm/qwasmcompositor.cpp
index c534cce9ef5..dfac0e0b88e 100644
--- a/src/plugins/platforms/wasm/qwasmcompositor.cpp
+++ b/src/plugins/platforms/wasm/qwasmcompositor.cpp
@@ -86,7 +86,7 @@ void QWasmCompositor::requestUpdate()
     if (m_requestUpdateHoldEnabled)
         return;
 
-    static auto frame = [](double frameTime, void *context) -> int {
+    static auto frame = [](double frameTime, void *context) -> EM_BOOL {
         Q_UNUSED(frameTime);
 
         QWasmCompositor *compositor = reinterpret_cast<QWasmCompositor *>(context);
@@ -94,7 +94,7 @@ void QWasmCompositor::requestUpdate()
         compositor->m_requestAnimationFrameId = -1;
         compositor->deliverUpdateRequests();
 
-        return 0;
+        return EM_FALSE;
     };
     m_requestAnimationFrameId = emscripten_request_animation_frame(frame, this);
 }
diff --git a/src/plugins/platforms/wasm/qwasmintegration.cpp b/src/plugins/platforms/wasm/qwasmintegration.cpp
index e4373749d82..a1129f54e31 100644
--- a/src/plugins/platforms/wasm/qwasmintegration.cpp
+++ b/src/plugins/platforms/wasm/qwasmintegration.cpp
@@ -126,14 +126,14 @@ QWasmIntegration::QWasmIntegration()
 
     // install browser window resize handler
     emscripten_set_resize_callback(EMSCRIPTEN_EVENT_TARGET_WINDOW, nullptr, EM_TRUE,
-                                   [](int, const EmscriptenUiEvent *, void *) -> int {
+                                   [](int, const EmscriptenUiEvent *, void *) -> EM_BOOL {
                                        // This resize event is called when the HTML window is
                                        // resized. Depending on the page layout the elements might
                                        // also have been resized, so we update the Qt screen sizes
                                        // (and canvas render sizes).
                                        if (QWasmIntegration *integration = QWasmIntegration::get())
                                            integration->resizeAllScreens();
-                                       return 0;
+                                       return EM_FALSE;
                                    });
 
     // install visualViewport resize handler which picks up size and scale change on mobile.