--- libmalloc/libmalloc-792.80.2/xcodeconfig/libmalloc_xctests.xcconfig
+++ libmalloc/libmalloc-521.120.7/xcodeconfig/libmalloc_xctests.xcconfig
@@ -7,7 +7,7 @@
 INFOPLIST_FILE = tests/xctests/Info.plist
 PRODUCT_BUNDLE_IDENTIFIER = com.apple.libmalloc-xctests
 
-OTHER_CFLAGS = $(inherited) -fno-builtin
+OTHER_CFLAGS = $(inherited) -fno-builtin -fno-typed-memory-operations
 OTHER_LDFLAGS = $(inherited) -framework Foundation -lCrashReporterClient
 
 CLANG_ENABLE_OBJC_ARC = YES