diff --git a/cpp/Makefile b/cpp/Makefile
index 7d3d89c2ce..5146006360 100644
--- a/cpp/Makefile
+++ b/cpp/Makefile
@@ -22,7 +22,7 @@ else
 	CXXFLAGS += -O3 -Wall -Werror -Wextra -DNDEBUG
 endif
 
-CXXFLAGS += -std=c++20 -iquote . -D_FILE_OFFSET_BITS=64 -D_LARGEFILE64_SOURCE -DFMT_HEADER_ONLY
+CXXFLAGS += -std=c++20 -iquote . -D_FILE_OFFSET_BITS=64 -DFMT_HEADER_ONLY
 
 ## EXTRA_FLAGS : Can be used to pass special purpose flags
 CXXFLAGS += $(EXTRA_FLAGS)