diff --git a/Makefile b/Makefile
index ff3d013..64fa1f8 100644
--- a/Makefile
+++ b/Makefile
@@ -20,7 +20,7 @@ ifneq ($(BUILD),i586-pc-haiku)
   WARNFLAGS := $(WARNFLAGS) -Werror
 endif
 
-CFLAGS := -D_BSD_SOURCE -I$(CURDIR)/include/ \
+CFLAGS := -D_DEFAULT_SOURCE -I$(CURDIR)/include/ \
 	-I$(CURDIR)/src $(WARNFLAGS) $(CFLAGS)
 ifneq ($(GCCVER),2)
   CFLAGS := $(CFLAGS) -std=c99