diff --git a/build.sh b/build.sh
index d5e402e..c8784c4 100755
--- a/build.sh
+++ b/build.sh
@@ -5,11 +5,11 @@ cd ..
 # Note: libz.a generated by EM_SAVE_DIR=1 python tests/runner.py test_zlib
 
 # Test:
-#~/Dev/emscripten/emcc -O2 libxml2-2.7.8/xmllint.o libxml2-2.7.8/.libs/libxml2.a libz.a -o xmllint.test.js --embed-file test.xml --embed-file test.xsd
+#~/Dev/emscripten/emcc -O2 -s EMULATE_FUNCTION_POINTER_CASTS=1 libxml2-2.7.8/xmllint.o libxml2-2.7.8/.libs/libxml2.a libz.a -o xmllint.test.js --embed-file test.xml --embed-file test.xsd
 # js xmllint.test.js --noout --schema test.xsd test.xml
 
 # Production
-~/Dev/emscripten/emcc -O2 libxml2-2.7.8/xmllint.o libxml2-2.7.8/.libs/libxml2.a libz.a -o xmllint.raw.js --pre-js pre.js
+~/Dev/emscripten/emcc -O2 -s EMULATE_FUNCTION_POINTER_CASTS=1 libxml2-2.7.8/xmllint.o libxml2-2.7.8/.libs/libxml2.a libz.a -o xmllint.raw.js --pre-js pre.js
 echo "function validateXML(xml, schema) {" > xmllint.js
 echo "  var Module = {" >> xmllint.js
 echo "    xml: xml," >> xmllint.js