diff --git a/configure.in b/configure.in
index 0dd9203792..a0dd303406 100644
--- a/configure.in
+++ b/configure.in
@@ -2606,7 +2606,7 @@ AS_CASE(["$target_os"],
 	CPPFLAGS="$CPPFLAGS -I/boot/home/config/include"
 	],
     [cygwin*|mingw*], [
-	RUBY_SO_NAME="${RUBY_SO_NAME}${MAJOR}${MINOR}${TEENY}"
+	RUBY_SO_NAME="${RUBY_SO_NAME}"'$(MAJOR)$(MINOR)$(TEENY)'
 	LIBRUBY_DLDFLAGS="${DLDFLAGS}"' -Wl,--out-implib=$(LIBRUBY)'
 	AS_CASE(["$target_os"],
 	[cygwin*], [