diff --git a/mach/arm/mach_params b/mach/arm/mach_params
index e50b2830..3e1799f7 100644
--- a/mach/arm/mach_params
+++ b/mach/arm/mach_params
@@ -1,5 +1,5 @@
 MACH=arm
-SUF=s
+SUF=so
 ASAR=arch
 RANLIB=:
 MACHFL=-O -DUFS