diff --git a/mozilla/xpcom/libxpt/src/Makefile.in b/mozilla/xpcom/libxpt/src/Makefile.in
index 032ae4a2e9b..46499e3ff55 100644
--- a/mozilla/xpcom/libxpt/src/Makefile.in
+++ b/mozilla/xpcom/libxpt/src/Makefile.in
@@ -37,4 +37,10 @@ REQUIRES	= $(MODULE)
 # available to xpidl, which also must be built early.
 export:: libs
 
+#
+# Because ../tools/Makefile.in requires libxpt.a, we have to force the
+# static lib to be built, even if NO_STATIC_LIB is defined.
+#
+override NO_STATIC_LIB=
+
 include $(topsrcdir)/config/rules.mk