--- widelands-build19-rc1/CMakeLists.txt
+++ widelands-build19-rc1/CMakeLists.txt
@@ -146,19 +146,13 @@
   option(OPTION_ASAN "Build with AddressSanitizer" ON)
 elseif(CMAKE_BUILD_TYPE STREQUAL "Release")
   if(("${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU") AND (CMAKE_CXX_COMPILER_VERSION VERSION_GREATER 6.2))
-    message(STATUS "GCC >6.2.0 breaks -03, setting -02")
-    set(WL_OPTIMIZE_FLAGS "-O2")
-  else()
-    set(WL_OPTIMIZE_FLAGS "-O3")
+    message(STATUS "GCC >6.2.0 breaks -03")
   endif ()
   set(WL_DEBUG_FLAGS "-DNDEBUG -DNOPARACHUTE")
   option(OPTION_ASAN "Build with AddressSanitizer" OFF)
 elseif(CMAKE_BUILD_TYPE STREQUAL "RelWithDebInfo")
   if(("${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU") AND (CMAKE_CXX_COMPILER_VERSION VERSION_GREATER 6.2))
-    message(STATUS "GCC >6.2.0 breaks -03, setting -02")
-    set(WL_OPTIMIZE_FLAGS "-O2")
-  else()
-    set(WL_OPTIMIZE_FLAGS "-O3")
+    message(STATUS "GCC >6.2.0 breaks -03")
   endif ()
   set(WL_DEBUG_FLAGS "-DNDEBUG -DNOPARACHUTE")
   option(OPTION_ASAN "Build with AddressSanitizer" ON)