diff --git a/tests/CMakeLists.txt b/tests/CMakeLists.txt
index 986076e2..8f3f81fc 100644
--- a/tests/CMakeLists.txt
+++ b/tests/CMakeLists.txt
@@ -13,6 +13,7 @@ set(CMAKE_MODULE_PATH "${CMAKE_SOURCE_DIR}")
 # Build debug build as default
 if(NOT CMAKE_BUILD_TYPE)
   set(CMAKE_BUILD_TYPE RelWithDebInfo)
+  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fno-strict-aliasing")
 endif()
 
 if(${CMAKE_BUILD_TYPE} STREQUAL "Debug")