3 files changed, 9 insertions, 4 deletions
diff --git a/ext/objspace/object_tracing.c b/ext/objspace/object_tracing.c
index 45b06aef8c..975518c654 100644
--- a/ext/objspace/object_tracing.c
+++ b/ext/objspace/object_tracing.c
@@ -287,7 +287,10 @@ object_allocations_reporter_i(st_data_t key, st_data_t val, st_data_t ptr)
     if (info->class_path) fprintf(out, "C: %s", info->class_path);
     else                  fprintf(out, "C: %p", (void *)info->klass);
     fprintf(out, "@%s:%lu", info->path ? info->path : "", info->line);
-    if (!NIL_P(info->mid)) fprintf(out, " (%s)", rb_id2name(SYM2ID(info->mid)));
+    if (!NIL_P(info->mid)) {
+	VALUE m = rb_sym2str(info->mid);
+	fprintf(out, " (%s)", RSTRING_PTR(m));
+    }
     fprintf(out, ")\n");
 
     return ST_CONTINUE;
diff --git a/ext/objspace/objspace.c b/ext/objspace/objspace.c
index b1f1358c01..88ebfca20e 100644
--- a/ext/objspace/objspace.c
+++ b/ext/objspace/objspace.c
@@ -545,7 +545,7 @@ iow_inspect(VALUE self)
     VALUE obj = (VALUE)DATA_PTR(self);
     VALUE type = type2sym(BUILTIN_TYPE(obj));
 
-    return rb_sprintf("#<InternalObject:%p %s>", (void *)obj, rb_id2name(SYM2ID(type)));
+    return rb_sprintf("#<InternalObject:%p %"PRIsVALUE">", (void *)obj, rb_sym2str(type));
 }
 
 /* Returns the Object#object_id of the internal object. */
diff --git a/ext/objspace/objspace_dump.c b/ext/objspace/objspace_dump.c
index e13cc39a6c..cb8f943d97 100644
--- a/ext/objspace/objspace_dump.c
+++ b/ext/objspace/objspace_dump.c
@@ -244,8 +244,10 @@ dump_object(VALUE obj, struct dump_config *dc)
 
     if ((ainfo = objspace_lookup_allocation_info(obj))) {
 	dump_append(dc, ", \"file\":\"%s\", \"line\":%lu", ainfo->path, ainfo->line);
-	if (RTEST(ainfo->mid))
-	    dump_append(dc, ", \"method\":\"%s\"", rb_id2name(SYM2ID(ainfo->mid)));
+	if (RTEST(ainfo->mid)) {
+	    VALUE m = rb_sym2str(ainfo->mid);
+	    dump_append(dc, ", \"method\":\"%s\"", RSTRING_PTR(m));
+	}
 	dump_append(dc, ", \"generation\":%"PRIuSIZE, ainfo->generation);
     }