--- a/default.so.do
+++ b/default.so.do
@@ -47,7 +47,7 @@
     redo-ifchange "$OUT/$2.a"
     ln -s $2.a "$sofile"
 else
-    $CXX -o "$sofile" -shared \
+    $CXX -o "$sofile" -shared -Wl,-soname,$sofile \
         $zdefs \
         $LDFLAGS \
         $obj $libdep $libs