diff --git a/content/xbl/src/Makefile.in b/content/xbl/src/Makefile.in
index 2978840b3eb..c9deaf89715 100644
--- a/content/xbl/src/Makefile.in
+++ b/content/xbl/src/Makefile.in
@@ -50,6 +50,7 @@ LOCAL_INCLUDES	= \
 		-I$(srcdir)/../../html/base/src \
 		-I$(srcdir)/../../html/forms/src \
 		-I$(srcdir)/../../html/content/src \
+    -I$(srcdir)/../../html/document/src \
 		-I$(srcdir)/../../xml/content/src \
     -I$(srcdir)/../../xml/document/src \
 		-I$(srcdir)/../../base/public \
diff --git a/layout/xbl/src/Makefile.in b/layout/xbl/src/Makefile.in
index 2978840b3eb..c9deaf89715 100644
--- a/layout/xbl/src/Makefile.in
+++ b/layout/xbl/src/Makefile.in
@@ -50,6 +50,7 @@ LOCAL_INCLUDES	= \
 		-I$(srcdir)/../../html/base/src \
 		-I$(srcdir)/../../html/forms/src \
 		-I$(srcdir)/../../html/content/src \
+    -I$(srcdir)/../../html/document/src \
 		-I$(srcdir)/../../xml/content/src \
     -I$(srcdir)/../../xml/document/src \
 		-I$(srcdir)/../../base/public \