diff --git a/external/backtrace-cpp/CMakeLists.txt b/external/backtrace-cpp/CMakeLists.txt
index c9ae155..b31bb8c 100644
--- a/external/backtrace-cpp/CMakeLists.txt
+++ b/external/backtrace-cpp/CMakeLists.txt
@@ -38,7 +38,7 @@ if (CMAKE_CXX_COMPILER_ID STREQUAL "Clang" OR CMAKE_COMPILER_IS_GNUCXX)
 endif()
 
 # ANBOX: allow old-style casts
-set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wno-error=old-style-cast")
+set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wno-error=old-style-cast -Wno-error=switch-default")
 
 ###############################################################################
 # BACKWARD OBJECT