diff --git a/Makefile b/Makefile
index 8a6df89..2da55e4 100644
--- a/Makefile
+++ b/Makefile
@@ -4,7 +4,7 @@ SRC = $(shell pwd)
 DEP = $(SRC)/dep_root
 STRIP = strip
 CC ?= cc
-CFLAGS += -I$(DEP)/include -I$(SRC)/include -I$(SRC)
+CFLAGS += -I$(DEP)/include -I$(SRC)/include -I$(SRC) -D_XOPEN_SOURCE=500
 CFLAGS += -Wall -Wextra -Wno-unused-parameter -DPALERAIN_VERSION=\"2.0.0\"
 CFLAGS += -Wno-unused-variable -I$(SRC)/src -std=c99 -pedantic-errors -D_C99_SOURCE -D_POSIX_C_SOURCE=200112L
 LIBS += $(DEP)/lib/libimobiledevice-1.0.a $(DEP)/lib/libirecovery-1.0.a $(DEP)/lib/libusbmuxd-2.0.a