1 files changed, 1 insertions, 1 deletions
diff --git a/Makefile b/Makefile
index 127a418..5cae7bd 100644
--- a/Makefile
+++ b/Makefile
@@ -5,7 +5,7 @@ MANPREFIX := $(PREFIX)/share/man
 
 CC        ?= gcc
 CFLAGS    += -std=c99 -Wall -pedantic
-CPPFLAGS  += -I$(PREFIX)/include -D_XOPEN_SOURCE=500
+CPPFLAGS  += -I$(PREFIX)/include -D_XOPEN_SOURCE=700
 LDFLAGS   += -L$(PREFIX)/lib
 LIBS      := -lX11 -lImlib2