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-rw-r--r--ruby/ext/google/protobuf_c/extconf.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/ruby/ext/google/protobuf_c/extconf.rb b/ruby/ext/google/protobuf_c/extconf.rb
index 9675f57f..b368dcc6 100644
--- a/ruby/ext/google/protobuf_c/extconf.rb
+++ b/ruby/ext/google/protobuf_c/extconf.rb
@@ -2,7 +2,7 @@
require 'mkmf'
-$CFLAGS += " -O3 -DNDEBUG"
+$CFLAGS += " -std=c99 -O3 -DNDEBUG"
$objs = ["protobuf.o", "defs.o", "storage.o", "message.o",
"repeated_field.o", "map.o", "encode_decode.o", "upb.o"]