diff --git a/src/Makefile.am b/src/Makefile.am
index 6fe3e9a..7446fc8 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -15,4 +15,4 @@ libjansson_la_SOURCES = \
 	value.c
 libjansson_la_LDFLAGS = -version-info 0:0:0
 
-AM_CFLAGS = -Wall -Wextra -Werror -std=c99
+AM_CFLAGS = -Wall -Wextra -Werror