diff --git a/toolkit/components/downloads/Makefile.in b/toolkit/components/downloads/Makefile.in
index 334c066fbf02..1188f04d7bac 100644
--- a/toolkit/components/downloads/Makefile.in
+++ b/toolkit/components/downloads/Makefile.in
@@ -12,7 +12,6 @@ include $(DEPTH)/config/autoconf.mk
 
 LIBRARY_NAME = download_s
 LIBXUL_LIBRARY = 1
-FAIL_ON_WARNINGS = 1
 
 include $(topsrcdir)/config/rules.mk