diff --git a/src/core/bus.cpp b/src/core/bus.cpp
index f38caeadf..5c09bc97c 100644
--- a/src/core/bus.cpp
+++ b/src/core/bus.cpp
@@ -967,7 +967,7 @@ ALWAYS_INLINE_RELEASE void DoInstructionRead(PhysicalMemoryAddress address, void
   }
   else if (address >= BIOS_BASE && address < (BIOS_BASE + BIOS_SIZE))
   {
-    std::memcpy(data, &g_bios[(address - BIOS_BASE) & BIOS_MASK], sizeof(u32));
+    std::memcpy(data, &g_bios[(address - BIOS_BASE) & BIOS_MASK], sizeof(u32) * word_count);
     if constexpr (add_ticks)
       g_state.pending_ticks += m_bios_access_time[static_cast<u32>(MemoryAccessSize::Word)] * word_count;
   }