diff --git a/extensions/java/xpcom/src/Makefile.in b/extensions/java/xpcom/src/Makefile.in
--- a/extensions/java/xpcom/src/Makefile.in
+++ b/extensions/java/xpcom/src/Makefile.in
@@ -45,16 +45,19 @@ MODULE		= javaxpcom
 LIBRARY_NAME	= javaxpcom
 LIBXUL_LIBRARY	= 1
 FORCE_STATIC_LIB = 1
 
 ifndef MOZ_ENABLE_LIBXUL
 DEFINES += -DIMPL_XREAPI
 endif
 
+REQUIRES += \
+  xpcom \
+  $(NULL)
 
 CPPSRCS		= \
 		nsAppFileLocProviderProxy.cpp \
 		nsJavaInterfaces.cpp \
 		nsJavaWrapper.cpp \
 		nsJavaXPTCStub.cpp \
 		nsJavaXPTCStubWeakRef.cpp \
 		nsJavaXPCOMBindingUtils.cpp \