diff --git a/src/configure.ac b/src/configure.ac
index 0d8ea32..8994f3c 100644
--- a/src/configure.ac
+++ b/src/configure.ac
@@ -1956,6 +1956,9 @@
 	AC_DEFINE(FEAT_RUBY)
 	if test "$enable_rubyinterp" = "dynamic"; then
 	  libruby_soname=`$vi_cv_path_ruby -r rbconfig -e "puts $ruby_rbconfig::CONFIG[['LIBRUBY_ALIASES']].split[[0]]"`
+	  if test -z "$libruby_soname"; then
+	    libruby_soname=`$vi_cv_path_ruby -r rbconfig -e "puts $ruby_rbconfig::CONFIG[['LIBRUBY_SO']]"`
+	  fi
 	  AC_DEFINE(DYNAMIC_RUBY)
 	  RUBY_CFLAGS="-DDYNAMIC_RUBY_DLL=\\\"$libruby_soname\\\" -DDYNAMIC_RUBY_VER=$rubyversion $RUBY_CFLAGS"
 	  RUBY_LIBS=