1 files changed, 1 insertions, 1 deletions
diff --git a/Makefile b/Makefile
index 0d79c1f..74fdda6 100644
--- a/Makefile
+++ b/Makefile
@@ -1,5 +1,5 @@
 CC      := gcc
-CFLAGS  := -std=c11 -O2 -Wall -Wextra -Wno-unused-parameter -g
+CFLAGS  := -std=c11 -O2 -Wall -Wextra -Wno-unused-parameter -g -D_POSIX_C_SOURCE=200809L
 LDFLAGS :=
 SRCDIR  := src
 BUILD   := build