1 files changed, 1 insertions, 0 deletions

diff --git a/Makefile b/Makefile
index 5386d93..1781b5f 100644
--- a/Makefile
+++ b/Makefile
@@ -8,6 +8,7 @@ DEPLOY=tbdiff-deploy
 CREATE=tbdiff-create
 
 CFLAGS ?=
+CFLAGS += -std=gnu99
 CFLAGS += -g
 CFLAGS += -Wall -Wextra -Werror -Wno-unused-result $(OPT)