diff --git a/toolkit/components/passwordmgr/test/Makefile.in b/toolkit/components/passwordmgr/test/Makefile.in
index 8552ab45bd59..461b6fc92683 100644
--- a/toolkit/components/passwordmgr/test/Makefile.in
+++ b/toolkit/components/passwordmgr/test/Makefile.in
@@ -53,7 +53,6 @@ MOCHITEST_FILES = \
     test_maxforms_3.html \
     test_notifications.html \
     test_notifications_popup.html \
-    test_privbrowsing.html \
     test_prompt_async.html \
     test_xhr.html \
     test_xml_load.html \
@@ -83,6 +82,12 @@ MOCHITEST_FILES = \
     subtst_prompt_async.html \
     $(NULL)
 
+ifndef MOZ_PER_WINDOW_PRIVATE_BROWSING
+MOCHITEST_FILES += \
+    test_privbrowsing.html \
+    $(NULL)
+endif
+
 ifneq ($(OS_TARGET),Linux)
 MOCHITEST_FILES += \
     test_prompt.html \