diff --git a/Makefile.in b/Makefile.in
index cf07081..49da58f 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -235,6 +235,7 @@ pdfio1.def: $(LIBOBJS) Makefile
 	echo "LIBRARY pdfio1" >$@
 	echo "VERSION $(PDFIO_VERSION_MAJOR).$(PDFIO_VERSION_MINOR)" >>$@
 	echo "EXPORTS" >>$@
+	echo "_pdfio_win32_open" >>$@
 	nm $(LIBOBJS) 2>/dev/null | grep "T _" | awk '{print $$3}' | \
 		grep -v '^_ttf' | sed -e '1,$$s/^_//' | sort >>$@
 
diff --git a/pdfio1.def b/pdfio1.def
index c83b6d8..b4b0879 100644
--- a/pdfio1.def
+++ b/pdfio1.def
@@ -1,6 +1,7 @@
 LIBRARY pdfio1
 VERSION 1.7
 EXPORTS
+_pdfio_win32_open
 _pdfio_strlcpy
 _pdfio_strtod
 _pdfio_utf16cpy
@@ -64,6 +65,7 @@ _pdfioStreamOpen
 _pdfioStringAllocBuffer
 _pdfioStringFreeBuffer
 _pdfioStringIsAllocated
+_pdfioStringPrintf
 _pdfioTokenClear
 _pdfioTokenFlush
 _pdfioTokenGet