diff --git a/configure.ac b/configure.ac
index f0e627b..501d83e 100644
--- a/configure.ac
+++ b/configure.ac
@@ -10,7 +10,7 @@ AC_CONFIG_HEADERS([config.h])
 AC_PROG_CC
 m4_ifdef([AM_PROG_AR], [AM_PROG_AR])
 #LT_INIT([disable-static])
-LT_INIT
+LT_INIT([win32-dll])
 AC_CONFIG_MACRO_DIR([m4])
 m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([yes])])
 
diff --git a/src/Makefile.am b/src/Makefile.am
index e18d754..c645b70 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -11,7 +11,7 @@ libpsl_la_CPPFLAGS = -I$(top_srcdir)/include -I$(top_builddir)/include -DPSL_DIS
   $(CFLAG_VISIBILITY) -DBUILDING_PSL
 
 # include ABI version information
-libpsl_la_LDFLAGS = -version-info $(LIBPSL_SO_VERSION)
+libpsl_la_LDFLAGS = -no-undefined -version-info $(LIBPSL_SO_VERSION)
 if WITH_LIBICU
   libpsl_la_LDFLAGS += $(LIBICU_LIBS)
 endif