1 files changed, 1 insertions, 1 deletions
diff --git a/config.mk b/config.mk
index f85e0fc..f6a3652 100644
--- a/config.mk
+++ b/config.mk
@@ -19,7 +19,7 @@ INCS = -I. -I/usr/include -I${X11INC}
 LIBS = -L/usr/lib -lc -L${X11LIB} -lX11 ${XINERAMALIBS}
 
 # flags
-CPPFLAGS = -DVERSION=\"${VERSION}\" ${XINERAMAFLAGS}
+CPPFLAGS = -D_BSD_SOURCE -DVERSION=\"${VERSION}\" ${XINERAMAFLAGS}
 CFLAGS = -std=c99 -pedantic -Wall -Os ${INCS} ${CPPFLAGS}
 LDFLAGS = -s ${LIBS}