diff --git a/Makefile b/Makefile
index 51581973ab..aabf0130b9 100644
--- a/Makefile
+++ b/Makefile
@@ -645,6 +645,7 @@ ifeq ($(uname_S),Darwin)
 	endif
 	NO_STRLCPY = YesPlease
 	NO_MEMMEM = YesPlease
+	THREADED_DELTA_SEARCH = YesPlease
 endif
 ifeq ($(uname_S),SunOS)
 	NEEDS_SOCKET = YesPlease