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-rw-r--r--spec/ruby/optional/capi/ext/class_spec.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/spec/ruby/optional/capi/ext/class_spec.c b/spec/ruby/optional/capi/ext/class_spec.c
index 6e5c02e657..e62b9efe2e 100644
--- a/spec/ruby/optional/capi/ext/class_spec.c
+++ b/spec/ruby/optional/capi/ext/class_spec.c
@@ -45,7 +45,7 @@ static VALUE class_spec_rb_class_new_instance(VALUE self,
VALUE nargs, VALUE args,
VALUE klass) {
int c_nargs = FIX2INT(nargs);
- VALUE *c_args = alloca(sizeof(VALUE) * c_nargs);
+ VALUE *c_args = (VALUE*)alloca(sizeof(VALUE) * c_nargs);
int i;
for (i = 0; i < c_nargs; i++)