diff --git a/contrib/Makefile.in b/contrib/Makefile.in
index 038c41c..7192258 100644
--- a/contrib/Makefile.in
+++ b/contrib/Makefile.in
@@ -18,7 +18,7 @@ contrib/%.a: contrib/%.o
 	$(V)echo "    [AR] $@"
 	$(V)$(AR) rcs $@ $^
 
-contrib/%.so: contrib/%.a
+contrib/%.so: contrib/%.o
 	$(V)echo "    [LD] $@"
 	$(V)$(CC) -shared -Wl,-soname,$@ -o $@ $<