diff --git a/sys/src/libmp/mips/mkfile b/sys/src/libmp/mips/mkfile
index 96d9114ee..96f917827 100644
--- a/sys/src/libmp/mips/mkfile
+++ b/sys/src/libmp/mips/mkfile
@@ -11,5 +11,5 @@ SFILES=\
 
 HFILES=/$objtype/include/u.h /sys/include/mp.h ../port/dat.h
 
-OFIL
+OFILES=${SFILES:%.s=%.$O}
 </sys/src/cmd/mksyslib