diff --git a/web/CMakeLists.txt b/web/CMakeLists.txt
index 01597e8..0e620b8 100644
--- a/web/CMakeLists.txt
+++ b/web/CMakeLists.txt
@@ -19,8 +19,8 @@ SET(_OPENTHREADS_ATOMIC_USE_GCC_BUILTINS_EXITCODE "0" CACHE STRING "Prevent cfg
 # We use SDL2 to do the following:
 # * OpenGL functions' address retrieval
 # * OpenGL graphics context creation
-SET(USE_SDL2 "-s USE_SDL=2")
-SET(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} ${USE_SDL2}" CACHE STRING "Use SDL2" FORCE)
+SET(FLAGS "-s USE_SDL=2 -s ERROR_ON_MISSING_LIBRARIES=0 -s ERROR_ON_UNDEFINED_SYMBOLS=0")
+SET(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} ${FLAGS}" CACHE STRING "Use SDL2" FORCE)
 # Build and reference OpenSceneGraph.
 SET(OSG_SOURCE_DIR "${EXT_PROJ_DIR}/OpenSceneGraph")
 SET(OSG_BUILD_DIR "${EXT_PROJ_DIR}/OpenSceneGraph/build/Emscripten")