diff --git a/network/module/tests/Makefile b/network/module/tests/Makefile
index db324a2eb429..12a8940fc062 100644
--- a/network/module/tests/Makefile
+++ b/network/module/tests/Makefile
@@ -25,7 +25,7 @@ CPPSRCS = \
 
 INCLUDES+=-I../src -I$(DIST)/include
 
-REQUIRES = raptor netlib xpcom
+REQUIRES = raptor netlib xpcom pref
 
 OBJS	= $(CPPSRCS:.cpp=.o)
 
diff --git a/network/module/tests/makefile.win b/network/module/tests/makefile.win
index f4f018501828..637a4bd7a798 100644
--- a/network/module/tests/makefile.win
+++ b/network/module/tests/makefile.win
@@ -78,6 +78,7 @@ LLIBS=$(LLIBS)				\
 LINCS=$(LINCS)  -I. \
                 -I$(PUBLIC)\raptor   \
                 -I$(PUBLIC)\netlib   \
+		-I$(PUBLIC)\pref     \
                 -I$(PUBLIC)\xpcom
 
 # clobber and clobber_all will remove the following garbage: