diff --git a/tools/sk_app/unix/WindowContextFactory_unix.h b/tools/sk_app/unix/WindowContextFactory_unix.h
index 47310970d5..e02e6eb5b7 100644
--- a/tools/sk_app/unix/WindowContextFactory_unix.h
+++ b/tools/sk_app/unix/WindowContextFactory_unix.h
@@ -36,15 +36,15 @@ struct XlibWindowInfo {
     int          fHeight;
 };
 
-std::unique_ptr<WindowContext> MakeVulkanForXlib(const XlibWindowInfo&, const DisplayParams&);
+SK_API std::unique_ptr<WindowContext> MakeVulkanForXlib(const XlibWindowInfo&, const DisplayParams&);
 
-std::unique_ptr<WindowContext> MakeGLForXlib(const XlibWindowInfo&, const DisplayParams&);
+SK_API std::unique_ptr<WindowContext> MakeGLForXlib(const XlibWindowInfo&, const DisplayParams&);
 
 #ifdef SK_DAWN
-std::unique_ptr<WindowContext> MakeDawnVulkanForXlib(const XlibWindowInfo&, const DisplayParams&);
+SK_API std::unique_ptr<WindowContext> MakeDawnVulkanForXlib(const XlibWindowInfo&, const DisplayParams&);
 #endif
 
-std::unique_ptr<WindowContext> MakeRasterForXlib(const XlibWindowInfo&, const DisplayParams&);
+SK_API std::unique_ptr<WindowContext> MakeRasterForXlib(const XlibWindowInfo&, const DisplayParams&);
 
 }  // namespace window_context_factory
 
diff --git a/tools/sk_app/win/WindowContextFactory_win.h b/tools/sk_app/win/WindowContextFactory_win.h
index 33dd6d413b..647e5ff81a 100644
--- a/tools/sk_app/win/WindowContextFactory_win.h
+++ b/tools/sk_app/win/WindowContextFactory_win.h
@@ -20,17 +20,17 @@ struct DisplayParams;
 
 namespace window_context_factory {
 
-std::unique_ptr<WindowContext> MakeVulkanForWin(HWND, const DisplayParams&);
+SK_API std::unique_ptr<WindowContext> MakeVulkanForWin(HWND, const DisplayParams&);
 
-std::unique_ptr<WindowContext> MakeGLForWin(HWND, const DisplayParams&);
+SK_API std::unique_ptr<WindowContext> MakeGLForWin(HWND, const DisplayParams&);
 
-std::unique_ptr<WindowContext> MakeANGLEForWin(HWND, const DisplayParams&);
+SK_API std::unique_ptr<WindowContext> MakeANGLEForWin(HWND, const DisplayParams&);
 
 #ifdef SK_DAWN
-std::unique_ptr<WindowContext> MakeDawnD3D12ForWin(HWND, const DisplayParams&);
+SK_API std::unique_ptr<WindowContext> MakeDawnD3D12ForWin(HWND, const DisplayParams&);
 #endif
 
-std::unique_ptr<WindowContext> MakeRasterForWin(HWND, const DisplayParams&);
+SK_API std::unique_ptr<WindowContext> MakeRasterForWin(HWND, const DisplayParams&);
 
 }  // namespace window_context_factory