1 files changed, 1 insertions, 1 deletions

diff --git a/Makefile b/Makefile
index b40650e..0f21fee 100644
--- a/Makefile
+++ b/Makefile
@@ -1,4 +1,4 @@
-CFLAGS += "-std=c99"
+CFLAGS += -std=c99 -D_XOPEN_SOURCE=500
 
 all: simulator