diff --git a/CMakeLists.txt b/CMakeLists.txt
index bacd6e7f..9a0de9d1 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -441,6 +441,8 @@ if(EMSCRIPTEN)
         PUBLIC "SHELL: --preload-file ${XEUS_CPP_DATA_DIR}@/share/xeus-cpp"
         PUBLIC "SHELL: --preload-file ${XEUS_CPP_CONF_DIR}@/etc/xeus-cpp"
         PUBLIC "SHELL: --post-js ${CMAKE_CURRENT_SOURCE_DIR}/wasm_patches/post.js"
+        PUBLIC "SHELL: -s STRICT=1"
+        PUBLIC "SHELL: --no-entry"
     )
     # TODO: Uncomment the above line regarding preloading clang's resource dir
     # once has been supported through cppinterop.
diff --git a/test/CMakeLists.txt b/test/CMakeLists.txt
index 88e8be76..c34826d1 100644
--- a/test/CMakeLists.txt
+++ b/test/CMakeLists.txt
@@ -69,6 +69,7 @@ if(EMSCRIPTEN)
         PUBLIC "SHELL: --preload-file ${SYSROOT_PATH}/include@/include"
         PUBLIC "SHELL: --preload-file ../${XEUS_CPP_DATA_DIR}@/share/xeus-cpp"
         PUBLIC "SHELL: --preload-file ../${XEUS_CPP_CONF_DIR}@/etc/xeus-cpp"
+        PUBLIC "SHELL: -s STRICT=1"
     )
 
     target_include_directories(test_xeus_cpp PRIVATE ${XEUS_CPP_INCLUDE_DIR})