1 files changed, 3 insertions, 7 deletions
diff --git a/gc.c b/gc.c
index fe5c5cff0d..968c13333c 100644
--- a/gc.c
+++ b/gc.c
@@ -3263,13 +3263,9 @@ rb_gc_mark_children(void *objspace, VALUE obj)
         if (fields_count) {
             VALUE klass = RBASIC_CLASS(obj);
 
-            // Skip updating max_iv_count if the prime classext is not writable
-            // because GC context doesn't provide information about namespaces.
-            if (RCLASS_PRIME_CLASSEXT_WRITABLE_P(klass)) {
-                // Increment max_iv_count if applicable, used to determine size pool allocation
-                if (RCLASS_MAX_IV_COUNT(klass) < fields_count) {
-                    RCLASS_SET_MAX_IV_COUNT(klass, fields_count);
-                }
+            // Increment max_iv_count if applicable, used to determine size pool allocation
+            if (RCLASS_MAX_IV_COUNT(klass) < fields_count) {
+                RCLASS_SET_MAX_IV_COUNT(klass, fields_count);
             }
         }