diff --git a/Source/Core/DiscIO/Blob.h b/Source/Core/DiscIO/Blob.h
index 3c4ea03307..52b083ab63 100644
--- a/Source/Core/DiscIO/Blob.h
+++ b/Source/Core/DiscIO/Blob.h
@@ -58,7 +58,7 @@ public:
   }
 
   virtual bool SupportsReadWiiDecrypted() const { return false; }
-  virtual bool ReadWiiDecrypted(u64 offset, u64 size, u8* out_ptr, u64 partition_offset)
+  virtual bool ReadWiiDecrypted(u64 offset, u64 size, u8* out_ptr, u64 partition_data_offset)
   {
     return false;
   }
diff --git a/Source/Core/DiscIO/DirectoryBlob.cpp b/Source/Core/DiscIO/DirectoryBlob.cpp
index 3df7b44256..64d4497925 100644
--- a/Source/Core/DiscIO/DirectoryBlob.cpp
+++ b/Source/Core/DiscIO/DirectoryBlob.cpp
@@ -387,12 +387,13 @@ bool DirectoryBlobReader::SupportsReadWiiDecrypted() const
   return m_is_wii;
 }
 
-bool DirectoryBlobReader::ReadWiiDecrypted(u64 offset, u64 size, u8* buffer, u64 partition_offset)
+bool DirectoryBlobReader::ReadWiiDecrypted(u64 offset, u64 size, u8* buffer,
+                                           u64 partition_data_offset)
 {
   if (!m_is_wii)
     return false;
 
-  auto it = m_partitions.find(partition_offset);
+  auto it = m_partitions.find(partition_data_offset);
   if (it == m_partitions.end())
     return false;
 
@@ -514,7 +515,8 @@ void DirectoryBlobReader::SetPartitions(std::vector<PartitionWithType>&& partiti
     SetPartitionHeader(partitions[i].partition, partition_address);
 
     const u64 partition_data_size = partitions[i].partition.GetDataSize();
-    m_partitions.emplace(partition_address, std::move(partitions[i].partition));
+    m_partitions.emplace(partition_address + PARTITION_DATA_OFFSET,
+                         std::move(partitions[i].partition));
     const u64 unaligned_next_partition_address = VolumeWii::EncryptedPartitionOffsetToRawOffset(
         partition_data_size, Partition(partition_address), PARTITION_DATA_OFFSET);
     partition_address = Common::AlignUp(unaligned_next_partition_address, 0x10000ull);
diff --git a/Source/Core/DiscIO/DirectoryBlob.h b/Source/Core/DiscIO/DirectoryBlob.h
index 0b15c3f807..47e0a6e0c8 100644
--- a/Source/Core/DiscIO/DirectoryBlob.h
+++ b/Source/Core/DiscIO/DirectoryBlob.h
@@ -141,7 +141,7 @@ public:
 
   bool Read(u64 offset, u64 length, u8* buffer) override;
   bool SupportsReadWiiDecrypted() const override;
-  bool ReadWiiDecrypted(u64 offset, u64 size, u8* buffer, u64 partition_offset) override;
+  bool ReadWiiDecrypted(u64 offset, u64 size, u8* buffer, u64 partition_data_offset) override;
 
   BlobType GetBlobType() const override;
   u64 GetRawSize() const override;
diff --git a/Source/Core/DiscIO/VolumeWii.cpp b/Source/Core/DiscIO/VolumeWii.cpp
index d2a1fba3db..970f3ad7e5 100644
--- a/Source/Core/DiscIO/VolumeWii.cpp
+++ b/Source/Core/DiscIO/VolumeWii.cpp
@@ -162,14 +162,17 @@ bool VolumeWii::Read(u64 offset, u64 length, u8* buffer, const Partition& partit
   if (partition == PARTITION_NONE)
     return m_reader->Read(offset, length, buffer);
 
-  if (m_reader->SupportsReadWiiDecrypted())
-    return m_reader->ReadWiiDecrypted(offset, length, buffer, partition.offset);
-
   auto it = m_partitions.find(partition);
   if (it == m_partitions.end())
     return false;
   const PartitionDetails& partition_details = it->second;
 
+  if (m_reader->SupportsReadWiiDecrypted())
+  {
+    return m_reader->ReadWiiDecrypted(offset, length, buffer,
+                                      partition.offset + *partition_details.data_offset);
+  }
+
   if (!m_encrypted)
   {
     return m_reader->Read(partition.offset + *partition_details.data_offset + offset, length,