diff --git a/mozilla/embedding/tests/winEmbed/makefile.win b/mozilla/embedding/tests/winEmbed/makefile.win
index b82edb02d1f..fbc75665bed 100644
--- a/mozilla/embedding/tests/winEmbed/makefile.win
+++ b/mozilla/embedding/tests/winEmbed/makefile.win
@@ -44,6 +44,20 @@ REQUIRES	= xpcom \
 PROGRAM         = .\$(OBJDIR)\$(MODULE).exe
 RESFILE         = $(MODULE).res
 
+
+#
+# Control the default heap size.
+# This is the heap returned by GetProcessHeap().
+# As we use the CRT heap, the default size is too large and wastes VM.
+#
+# The default heap size is 1MB on Win32.
+# The heap will grow if need be.
+#
+# Set it to 256k.  See bug 127069.
+#
+LLFLAGS=$(LLFLAGS) /HEAP:0x40000
+
+
 OBJS =                           \
     .\$(OBJDIR)\winEmbed.obj     \
     .\$(OBJDIR)\WebBrowserChrome.obj   \
diff --git a/mozilla/xpfe/bootstrap/makefile.win b/mozilla/xpfe/bootstrap/makefile.win
index 5f47727bd34..1d1f0a5deb7 100644
--- a/mozilla/xpfe/bootstrap/makefile.win
+++ b/mozilla/xpfe/bootstrap/makefile.win
@@ -97,6 +97,20 @@ LFLAGS= $(LFLAGS) /subsystem:console
 LFLAGS= $(LFLAGS) /subsystem:windows
 !endif
 
+
+#
+# Control the default heap size.
+# This is the heap returned by GetProcessHeap().
+# As we use the CRT heap, the default size is too large and wastes VM.
+#
+# The default heap size is 1MB on Win32.
+# The heap will grow if need be.
+#
+# Set it to 256k.  See bug 127069.
+#
+LLFLAGS=$(LLFLAGS) /HEAP:0x40000
+
+
 # These are the libraries we need to link with to create the exe
 LLIBS=                               \
  $(DIST)\lib\xpcom.lib               \