diff --git a/adsbus/Makefile b/adsbus/Makefile
index 2c299ac..9e454e8 100644
--- a/adsbus/Makefile
+++ b/adsbus/Makefile
@@ -1,6 +1,6 @@
 COMP ?= clang
 DISABLED_WARNINGS ?= -Wno-padded -Wno-disabled-macro-expansion
-CFLAGS ?= -Weverything -Werror -O3 -g --std=gnu11 --pedantic-errors -fPIE -fstack-protector-strong -pthread -D_GNU_SOURCE $(DISABLED_WARNINGS)
+CFLAGS ?= -Weverything -Werror -O3 -g --std=gnu11 --pedantic-errors -fPIE -fstack-protector-strong -pthread -D_GNU_SOURCE -D_FILE_OFFSET_BITS=64 $(DISABLED_WARNINGS)
 LDFLAGS ?= $(CFLAGS) -Wl,-z,relro -Wl,-z,now -pie
 LIBS ?= -ljansson -lprotobuf-c