diff --git a/Makefile b/Makefile
index a21d0d6..0dd5b2b 100644
--- a/Makefile
+++ b/Makefile
@@ -1,4 +1,4 @@
-STD=-ansi
+STD=-std=c99
 override CFLAGS+=-Werror -Wall -g -fPIC -O2 -DNDEBUG -ftrapv -Wfloat-equal -Wundef -Wwrite-strings -Wconversion -Wuninitialized -pedantic $(STD)
 DEBUG+=-DDEBUG_ON
 PREFIX=/usr/bin/