diff --git a/xcode/common.xcconfig b/xcode/common.xcconfig
index bb752d2513..198ccc11d5 100644
--- a/xcode/common.xcconfig
+++ b/xcode/common.xcconfig
@@ -58,5 +58,6 @@ ENABLE_STRICT_OBJC_MSGSEND = YES
 GCC_NO_COMMON_BLOCKS = YES
 GCC_PRECOMPILE_PREFIX_HEADER = YES
 ONLY_ACTIVE_ARCH = YES
+OTHER_SWIFT_FLAGS = -Xfrontend -warn-long-function-bodies=100
 PRODUCT_NAME = $(TARGET_NAME)
 VALID_ARCHS = i386 x86_64 armv7 armv7s arm64