diff --git a/tools/ios.toolchain.cmake b/tools/ios.toolchain.cmake
index 5a6db5c549..666b427e6a 100644
--- a/tools/ios.toolchain.cmake
+++ b/tools/ios.toolchain.cmake
@@ -783,9 +783,9 @@ else()
   set(CMAKE_C_FLAGS "${C_TARGET_FLAGS} ${APPLE_TARGET_TRIPLE_FLAG} ${SDK_NAME_VERSION_FLAGS} ${BITCODE} -fobjc-abi-version=2 ${FOBJC_ARC} ${CMAKE_C_FLAGS}")
   set(CMAKE_CXX_FLAGS "${C_TARGET_FLAGS} ${APPLE_TARGET_TRIPLE_FLAG} ${SDK_NAME_VERSION_FLAGS} ${BITCODE} ${VISIBILITY} -fobjc-abi-version=2 ${FOBJC_ARC} ${CMAKE_CXX_FLAGS}")
   set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS} -O0 -g ${CMAKE_CXX_FLAGS_DEBUG}")
-  set(CMAKE_CXX_FLAGS_MINSIZEREL "${CMAKE_CXX_FLAGS} -DNDEBUG -Os -ffast-math ${CMAKE_CXX_FLAGS_MINSIZEREL}")
-  set(CMAKE_CXX_FLAGS_RELWITHDEBINFO "${CMAKE_CXX_FLAGS} -DNDEBUG -O2 -g -ffast-math ${CMAKE_CXX_FLAGS_RELWITHDEBINFO}")
-  set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS} -DNDEBUG -O3 -ffast-math ${CMAKE_CXX_FLAGS_RELEASE}")
+  set(CMAKE_CXX_FLAGS_MINSIZEREL "${CMAKE_CXX_FLAGS} -DNDEBUG -Os ${CMAKE_CXX_FLAGS_MINSIZEREL}")
+  set(CMAKE_CXX_FLAGS_RELWITHDEBINFO "${CMAKE_CXX_FLAGS} -DNDEBUG -O2 -g ${CMAKE_CXX_FLAGS_RELWITHDEBINFO}")
+  set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS} -DNDEBUG -O3 ${CMAKE_CXX_FLAGS_RELEASE}")
   set(CMAKE_C_LINK_FLAGS "${C_TARGET_FLAGS} ${SDK_NAME_VERSION_FLAGS} -Wl,-search_paths_first ${CMAKE_C_LINK_FLAGS}")
   set(CMAKE_CXX_LINK_FLAGS "${C_TARGET_FLAGS} ${SDK_NAME_VERSION_FLAGS}  -Wl,-search_paths_first ${CMAKE_CXX_LINK_FLAGS}")
   set(CMAKE_ASM_FLAGS "${CMAKE_C_FLAGS} -x assembler-with-cpp -arch ${CMAKE_OSX_ARCHITECTURES} ${APPLE_TARGET_TRIPLE_FLAG}")