diff --git a/libltdl/ltdl.h b/libltdl/ltdl.h
index 2d01e7e7..3617e79c 100644
--- a/libltdl/ltdl.h
+++ b/libltdl/ltdl.h
@@ -34,6 +34,10 @@ License along with GNU Libltdl.  If not, see <https://www.gnu.org/licenses/>.
 #include <libltdl/lt_error.h>
 #include <libltdl/lt_dlloader.h>
 
+#if defined _WIN32 && !defined __CYGWIN__
+#include <io.h>
+#endif
+
 LT_BEGIN_C_DECLS
 
 
diff --git a/libltdl/ltdl.mk b/libltdl/ltdl.mk
index 7cf9f386..46109775 100644
--- a/libltdl/ltdl.mk
+++ b/libltdl/ltdl.mk
@@ -35,7 +35,7 @@ AM_CPPFLAGS	       += -DLT_CONFIG_H='<$(LT_CONFIG_H)>' \
 			  -I$(srcdir)/libltdl -Ilibltdl/libltdl \
 			  -I$(srcdir)/libltdl/libltdl
 AM_LDFLAGS	       += -no-undefined
-LTDL_VERSION_INFO	= -version-info 10:3:3
+LTDL_VERSION_INFO	= -version-info 10:4:3
 
 noinst_LTLIBRARIES	+= $(LT_DLLOADERS)