diff --git a/toolchains/common.cmake b/toolchains/common.cmake
index fe2f19c..0d6d55f 100644
--- a/toolchains/common.cmake
+++ b/toolchains/common.cmake
@@ -15,6 +15,7 @@
     string(APPEND CMAKE_${language}_FLAGS_INIT "-ffunction-sections ")
     string(APPEND CMAKE_${language}_FLAGS_INIT "-fdata-sections ")
     string(APPEND CMAKE_${language}_FLAGS_INIT "-Wall -Werror -Wstrict-overflow ")
+    string(APPEND CMAKE_${language}_FLAGS_INIT "-Wextra -Wno-implicit-fallthrough ")
     string(APPEND CMAKE_${language}_FLAGS_INIT "-gdwarf-4 ")
     string(APPEND CMAKE_${language}_FLAGS_INIT "-D_FORTIFY_SOURCE=2 ")
     string(APPEND CMAKE_${language}_FLAGS_DEBUG_INIT "-Og -Wnull-dereference ")