diff --git a/Misc/NEWS.d/next/Build/2018-10-17-17-38-57.bpo-35011.GgoPIC.rst b/Misc/NEWS.d/next/Build/2018-10-17-17-38-57.bpo-35011.GgoPIC.rst
new file mode 100644
index 00000000000..4411ffea45c
--- /dev/null
+++ b/Misc/NEWS.d/next/Build/2018-10-17-17-38-57.bpo-35011.GgoPIC.rst
@@ -0,0 +1,4 @@
+Restores the use of pyexpatns.h to isolate our embedded copy of the expat C
+library so that its symbols do not conflict at link or dynamic loading time
+with an embedding application or other extension modules with their own
+version of libexpat.
diff --git a/Modules/expat/expat_external.h b/Modules/expat/expat_external.h
index 629483a91b2..2d96b4f41ad 100644
--- a/Modules/expat/expat_external.h
+++ b/Modules/expat/expat_external.h
@@ -35,6 +35,10 @@
 
 /* External API definitions */
 
+/* Namespace external symbols to allow multiple libexpat version to
+   co-exist. */
+#include "pyexpatns.h"
+
 #if defined(_MSC_EXTENSIONS) && !defined(__BEOS__) && !defined(__CYGWIN__)
 # define XML_USE_MSC_EXTENSIONS 1
 #endif