diff --git a/Core/gb.c b/Core/gb.c
index aa36e3e..dc6babc 100644
--- a/Core/gb.c
+++ b/Core/gb.c
@@ -412,6 +412,7 @@ int GB_load_gbs_from_buffer(GB_gameboy_t *gb, const uint8_t *buffer, size_t size
     if (gb->mbc_ram) {
         free(gb->mbc_ram);
         gb->mbc_ram = NULL;
+        gb->mbc_ram_size = 0;
     }
     
     if (gb->cartridge_type->has_ram) {
diff --git a/Core/mbc.c b/Core/mbc.c
index 1e15f8a..a9e758e 100644
--- a/Core/mbc.c
+++ b/Core/mbc.c
@@ -141,6 +141,7 @@ void GB_configure_cart(GB_gameboy_t *gb)
     if (gb->mbc_ram) {
         free(gb->mbc_ram);
         gb->mbc_ram = NULL;
+        gb->mbc_ram_size = 0;
     }
 
     if (gb->cartridge_type->has_ram) {