diff --git a/src/Makefile.am b/src/Makefile.am
index 8a7b378a..8eac2b1f 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -202,7 +202,7 @@ libnghttp2_asio_la_SOURCES = \
 	asio_client_tls_context.cc asio_client_tls_context.h
 
 libnghttp2_asio_la_CPPFLAGS = ${AM_CPPFLAGS} ${BOOST_CPPFLAGS}
-libnghttp2_asio_la_LDFLAGS = -no-undefined -version-info 0:0:0
+libnghttp2_asio_la_LDFLAGS = -no-undefined -version-info 1:0:0
 libnghttp2_asio_la_LIBADD = \
 	$(top_builddir)/lib/libnghttp2.la \
 	$(top_builddir)/third-party/libhttp-parser.la \