diff --git a/toolkit/system/unixproxy/Makefile.in b/toolkit/system/unixproxy/Makefile.in
index a0e9d88297ad..b5a4f08469c5 100644
--- a/toolkit/system/unixproxy/Makefile.in
+++ b/toolkit/system/unixproxy/Makefile.in
@@ -58,7 +58,7 @@ REQUIRES = \
         mozgnome \
         $(NULL)
 
-EXTRA_DSO_LDOPTS = \
+EXTRA_DSO_LDOPTS += \
         $(XPCOM_GLUE_LDOPTS) \
         $(XPCOM_FROZEN_LDOPTS) \
         $(NSPR_LIBS) \