diff --git a/mozilla/browser/app/Makefile.in b/mozilla/browser/app/Makefile.in
index 7258e2e4eae..a196ddcdce4 100644
--- a/mozilla/browser/app/Makefile.in
+++ b/mozilla/browser/app/Makefile.in
@@ -70,6 +70,8 @@ REQUIRES = \
 
 CPPSRCS = nsBrowserApp.cpp
 
+LOCAL_INCLUDES += -I$(topsrcdir)/toolkit/xre
+
 ifdef BUILD_STATIC_LIBS
 STATIC_COMPONENTS_LINKER_PATH = -L$(DIST)/lib/components
 LIBS += $(DIST)/lib/$(LIB_PREFIX)xulapp_s.$(LIB_SUFFIX)
diff --git a/mozilla/mail/app/Makefile.in b/mozilla/mail/app/Makefile.in
index 46ed2fe3c1f..4919726456e 100644
--- a/mozilla/mail/app/Makefile.in
+++ b/mozilla/mail/app/Makefile.in
@@ -68,6 +68,8 @@ REQUIRES = \
 
 CPPSRCS = nsMailApp.cpp
 
+LOCAL_INCLUDES += -I$(topsrcdir)/toolkit/xre
+
 ifdef BUILD_STATIC_LIBS
 STATIC_COMPONENTS_LINKER_PATH = -L$(DIST)/lib/components
 LIBS += $(DIST)/lib/$(LIB_PREFIX)xulapp_s.$(LIB_SUFFIX)