diff --git a/toolkit/crashreporter/test/Makefile.in b/toolkit/crashreporter/test/Makefile.in
index 68297303c97c..166f4cddf723 100644
--- a/toolkit/crashreporter/test/Makefile.in
+++ b/toolkit/crashreporter/test/Makefile.in
@@ -3,6 +3,8 @@
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
+INTERNAL_TOOLS = 1
+
 UNIT_FILES = $(SHARED_LIBRARY) CrashTestUtils.jsm
 UNIT_DEST = $(DEPTH)/_tests/xpcshell/$(relativesrcdir)/unit/
 INSTALL_TARGETS += UNIT