diff --git a/configure.in b/configure.in
index 4710237a5d..97f777972a 100644
--- a/configure.in
+++ b/configure.in
@@ -1526,7 +1526,7 @@ m4_ifval([$3], dnl
 )dnl
 m4_pushdef([attrib_code],[m4_bpatsubst([$1],["],[\\"])])
 m4_ifval([$4], [rbcv_cond=["$4"]; test "$rbcv_cond" || unset rbcv_cond])
-AC_CACHE_CHECK(for [$2] function attribute, rbcv,
+AC_CACHE_CHECK(for m4_ifval([$2],[$2],[$1]) function attribute, rbcv,
 [rbcv=x
 RUBY_WERROR_FLAG([
 for mac in \