--- a/modules/pdfium/moz.build
+++ b/modules/pdfium/moz.build
@@ -554,9 +554,12 @@ LOCAL_INCLUDES += [
 ]
 USE_LIBS += [
     'media_libjpeg',
 ]
 
 # We allow warnings for third-party code that can be updated from upstream.
 ALLOW_COMPILER_WARNINGS = True
 
-FINAL_LIBRARY = 'xul'
+GeckoSharedLibrary('pdfium', linkage=None)
+
+if CONFIG['OS_TARGET'] == 'WINNT':
+    DEFFILE = SRCDIR + '/pdfium.def'

new file mode 100644
--- /dev/null
+++ b/modules/pdfium/pdfium.def
@@ -0,0 +1,14 @@
+; This Source Code Form is subject to the terms of the Mozilla Public
+; License, v. 2.0. If a copy of the MPL was not distributed with this
+; file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+LIBRARY pdfium
+EXPORTS
+    FPDF_InitLibrary
+    FPDF_DestroyLibrary
+    FPDF_LoadDocument
+    FPDF_CloseDocument
+    FPDF_GetPageCount
+    FPDF_LoadPage
+    FPDF_ClosePage
+    FPDF_RenderPage