diff --git a/libretro/libretro.cpp b/libretro/libretro.cpp
index 2e2f475253..40ab3c5d9f 100644
--- a/libretro/libretro.cpp
+++ b/libretro/libretro.cpp
@@ -1797,6 +1797,7 @@ bool retro_unserialize(const void *data, size_t size) {
    if (!gpu) {
       unserialize_data = malloc(size);
       memcpy(unserialize_data, data, size);
+      unserialize_size = size;
       return true;
    }