diff --git a/tool/m4/ruby_check_va_copy.m4 b/tool/m4/ruby_check_va_copy.m4 index cc885e56de..74338beb60 100644 --- a/tool/m4/ruby_check_va_copy.m4 +++ b/tool/m4/ruby_check_va_copy.m4 @@ -24,7 +24,7 @@ main() conftest(10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0); exit(0); }], - rb_cv_va_copy=[$1], + rb_cv_va_copy="$1", rb_cv_va_copy="", rb_cv_va_copy="")dnl fi