diff --git a/CMakeLists.txt b/CMakeLists.txt
index a4117aed61..9d24cc3a9f 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -12,6 +12,14 @@ add_definitions(-DRIME_VERSION="${rime_version}")
 
 include(GNUInstallDirs)
 
+if (MSVC)
+    # warning level 4
+    add_compile_options(/W4)
+else()
+    # additional warnings
+    add_compile_options(-Wall -Wextra -Wpedantic)
+endif()
+
 option(BUILD_SHARED_LIBS "Build Rime as shared library" ON)
 option(BUILD_MERGED_PLUGINS "Merge plugins into one Rime library" ON)
 option(BUILD_STATIC "Build with dependencies as static libraries" OFF)