1 files changed, 2 insertions, 2 deletions
diff --git a/gc.c b/gc.c
index 9178c9462f..e2c2779b47 100644
--- a/gc.c
+++ b/gc.c
@@ -11633,8 +11633,8 @@ gc_set_initial_pages(rb_objspace_t *objspace)
 
     for (int i = 0; i < SIZE_POOL_COUNT; i++) {
         rb_size_pool_t *size_pool = &size_pools[i];
-        char env_key[sizeof("RUBY_GC_HEAP_INIT_SIZE_" "_SLOTS") + DECIMAL_SIZE_OF_BITS(sizeof(size_pool->slot_size) * CHAR_BIT)];
-        snprintf(env_key, sizeof(env_key), "RUBY_GC_HEAP_INIT_SIZE_%d_SLOTS", size_pool->slot_size);
+        char env_key[sizeof("RUBY_GC_HEAP_" "_INIT_SLOTS") + DECIMAL_SIZE_OF_BITS(sizeof(int) * CHAR_BIT)];
+        snprintf(env_key, sizeof(env_key), "RUBY_GC_HEAP_%d_INIT_SLOTS", i);
 
         size_t size_pool_init_slots = gc_params.size_pool_init_slots[i];
         if (get_envparam_size(env_key, &size_pool_init_slots, 0)) {