diff --git a/Source/Core/Core/Src/HW/Memmap.cpp b/Source/Core/Core/Src/HW/Memmap.cpp
index 332ad2cfc9..40f98c56e4 100644
--- a/Source/Core/Core/Src/HW/Memmap.cpp
+++ b/Source/Core/Core/Src/HW/Memmap.cpp
@@ -509,7 +509,7 @@ bool Init()
 
 	memset(m_pRAM, 0, RAM_SIZE);
 	if (wii) {
-		memset(m_pPhysicalEXRAM, 0, RAM_SIZE);
+		memset(m_pPhysicalEXRAM, 0, EXRAM_SIZE);
 	}
 	memset(m_pEFB, 0, EFB_SIZE);
 	memset(m_pL1Cache, 0, L1_CACHE_SIZE);