diff --git a/srcpkgs/fossil/patches/cross.patch b/srcpkgs/fossil/patches/cross.patch
new file mode 100644
index 00000000000..678714a03b7
--- /dev/null
+++ b/srcpkgs/fossil/patches/cross.patch
@@ -0,0 +1,11 @@
+--- src/main.mk.orig	2017-01-17 09:23:50.673581733 +0100
++++ src/main.mk	2017-01-17 09:23:59.818548261 +0100
+@@ -10,7 +10,7 @@
+ # This file is included by primary Makefile.
+ #
+ 
+-XBCC = $(BCC) $(BCCFLAGS) $(CFLAGS)
++XBCC = $(BCC) -Os
+ XTCC = $(TCC) -I. -I$(SRCDIR) -I$(OBJDIR) $(TCCFLAGS) $(CFLAGS)
+ 
+