diff --git a/dom/ipc/Makefile.in b/dom/ipc/Makefile.in
index 40b5ee244ad..64b6bb1c714 100644
--- a/dom/ipc/Makefile.in
+++ b/dom/ipc/Makefile.in
@@ -47,12 +47,17 @@ LIBXUL_LIBRARY = 1
 FORCE_STATIC_LIB = 1
 EXPORT_LIBRARY = 1
 
-EXPORTS_NAMESPACES = mozilla
+EXPORTS_NAMESPACES = mozilla mozilla/dom
 
 EXPORTS_mozilla = \
   TabTypes.h \
   $(NULL)
 
+EXPORTS_mozilla/dom = \
+  ContentProcessChild.h \
+  ContentProcessParent.h \
+  $(NULL)
+
 CPPSRCS = \
   ContentProcessThread.cpp \
   ContentProcessParent.cpp \