diff --git a/Source/Core/Core/HW/Memmap.h b/Source/Core/Core/HW/Memmap.h
index e79252ba7d..41147b2049 100644
--- a/Source/Core/Core/HW/Memmap.h
+++ b/Source/Core/Core/HW/Memmap.h
@@ -155,28 +155,28 @@ private:
   u8* m_logical_page_mappings_base = nullptr;
 
   // The actual memory used for backing the memory map.
-  u8* m_ram;
-  u8* m_exram;
-  u8* m_l1_cache;
-  u8* m_fake_vmem;
+  u8* m_ram = nullptr;
+  u8* m_exram = nullptr;
+  u8* m_l1_cache = nullptr;
+  u8* m_fake_vmem = nullptr;
 
   // m_ram_size is the amount allocated by the emulator, whereas m_ram_size_real
   // is what will be reported in lowmem, and thus used by emulated software.
   // Note: Writing to lowmem is done by IPL. If using retail IPL, it will
   // always be set to 24MB.
-  u32 m_ram_size_real;
-  u32 m_ram_size;
-  u32 m_ram_mask;
-  u32 m_fakevmem_size;
-  u32 m_fakevmem_mask;
-  u32 m_l1_cache_size;
-  u32 m_l1_cache_mask;
+  u32 m_ram_size_real = 0;
+  u32 m_ram_size = 0;
+  u32 m_ram_mask = 0;
+  u32 m_fakevmem_size = 0;
+  u32 m_fakevmem_mask = 0;
+  u32 m_l1_cache_size = 0;
+  u32 m_l1_cache_mask = 0;
   // m_exram_size is the amount allocated by the emulator, whereas m_exram_size_real
   // is what gets used by emulated software.  If using retail IOS, it will
   // always be set to 64MB.
-  u32 m_exram_size_real;
-  u32 m_exram_size;
-  u32 m_exram_mask;
+  u32 m_exram_size_real = 0;
+  u32 m_exram_size = 0;
+  u32 m_exram_mask = 0;
 
   bool m_is_fastmem_arena_initialized = false;
 
@@ -231,12 +231,12 @@ private:
   //
   // TODO: The actual size of RAM is 24MB; the other 8MB shouldn't be backed by actual memory.
   // TODO: Do we want to handle the mirrors of the GC RAM?
-  std::array<PhysicalMemoryRegion, 4> m_physical_regions;
+  std::array<PhysicalMemoryRegion, 4> m_physical_regions{};
 
   std::vector<LogicalMemoryView> m_logical_mapped_entries;
 
-  std::array<void*, PowerPC::BAT_PAGE_COUNT> m_physical_page_mappings;
-  std::array<void*, PowerPC::BAT_PAGE_COUNT> m_logical_page_mappings;
+  std::array<void*, PowerPC::BAT_PAGE_COUNT> m_physical_page_mappings{};
+  std::array<void*, PowerPC::BAT_PAGE_COUNT> m_logical_page_mappings{};
 
   void InitMMIO(bool is_wii);
 };