diff --git a/mozilla/xpcom/tests/Makefile.in b/mozilla/xpcom/tests/Makefile.in
index d287121c060..ce4fee93940 100644
--- a/mozilla/xpcom/tests/Makefile.in
+++ b/mozilla/xpcom/tests/Makefile.in
@@ -46,6 +46,8 @@ CPPSRCS		= \
 		TestObserverService.cpp \
 		TestPipes.cpp \
 		TestThreads.cpp \
+		TestStrings.cpp \
+		TestVoidBTree.cpp \
 		$(NULL)
 
 SIMPLE_PROGRAMS	= $(CPPSRCS:.cpp=$(BIN_SUFFIX))
diff --git a/mozilla/xpcom/tests/makefile.win b/mozilla/xpcom/tests/makefile.win
index 6deb944a86b..df941f6e96b 100644
--- a/mozilla/xpcom/tests/makefile.win
+++ b/mozilla/xpcom/tests/makefile.win
@@ -43,7 +43,7 @@ PROG14 = .\$(OBJDIR)\TestObserverService.exe
 PROG16 = .\$(OBJDIR)\TestPipes.exe
 PROG17 = .\$(OBJDIR)\TestShutdown.exe
 PROG18 = .\$(OBJDIR)\TestStackCrawl.exe
-
+PROG19 = .\$(OBJDIR)\TestVoidBTree.exe
 
 RESFILE = timer.res
 
@@ -63,6 +63,7 @@ PROGRAMS = $(PROG1) \
            $(PROG16) \
            $(PROG17) \
            $(PROG18) \
+           $(PROG19) \
            $(NULL)
 
 LCFLAGS=-DUSE_NSREG -GX
@@ -105,3 +106,5 @@ $(PROG14): $(OBJDIR) TestObserverService.cpp
 $(PROG16): $(OBJDIR) TestPipes.cpp
 $(PROG17): $(OBJDIR) TestShutdown.cpp
 $(PROG18): $(OBJDIR) TestStackCrawl.cpp
+$(PROG19): $(OBJDIR) TestVoidBTree.cpp
+