1 files changed, 1 insertions, 1 deletions
diff --git a/Makefile b/Makefile
index b4f457c..093fdba 100644
--- a/Makefile
+++ b/Makefile
@@ -9,7 +9,7 @@ all: tests
 tests: $(TESTS)
 
 %: %.c
-	$(CC) -I. $< -o $@ -ggdb
+	$(CC) -I. $< -o $@ -ggdb -std=c99
 
 clean:
 	rm -rf $(TESTS)