diff --git a/src/Magnum/Platform/Sdl2Application.cpp b/src/Magnum/Platform/Sdl2Application.cpp
index 37db8dbe4..aaa3dfd9e 100644
--- a/src/Magnum/Platform/Sdl2Application.cpp
+++ b/src/Magnum/Platform/Sdl2Application.cpp
@@ -273,11 +273,13 @@ bool Sdl2Application::tryCreateContext(const Configuration& configuration) {
     return true;
 }
 
+#ifndef CORRADE_TARGET_EMSCRIPTEN
 Vector2i Sdl2Application::windowSize() {
     Vector2i size;
     SDL_GetWindowSize(_window, &size.x(), &size.y());
     return size;
 }
+#endif
 
 void Sdl2Application::swapBuffers() {
     #ifndef CORRADE_TARGET_EMSCRIPTEN
diff --git a/src/Magnum/Platform/Sdl2Application.h b/src/Magnum/Platform/Sdl2Application.h
index 5303d24ce..47f9d1f48 100644
--- a/src/Magnum/Platform/Sdl2Application.h
+++ b/src/Magnum/Platform/Sdl2Application.h
@@ -421,14 +421,17 @@ class Sdl2Application {
 
         /** @{ @name Screen handling */
 
+        #ifndef CORRADE_TARGET_EMSCRIPTEN
         /**
          * @brief Window size
          *
          * Window size to which all input event coordinates can be related.
          * Note that especially on HiDPI systems the reported window size might
          * not be the same as framebuffer size.
+         * @note Not available in @ref CORRADE_TARGET_EMSCRIPTEN "Emscripten".
          */
         Vector2i windowSize();
+        #endif
 
         /**
          * @brief Swap buffers