diff --git a/lib/libmisc/Makefile b/lib/libmisc/Makefile
index 0e19beedc909..4042d9c45430 100644
--- a/lib/libmisc/Makefile
+++ b/lib/libmisc/Makefile
@@ -35,6 +35,10 @@ include $(DEPTH)/config/config.mk
 
 ifdef MOZ_MAIL_NEWS
 CSRCS		+= mime.c
+else
+ifdef MOZ_MAIL_COMPOSE
+CSRCS		+= mime.c
+endif
 endif
 
 include $(DEPTH)/config/rules.mk