diff --git a/src/SBaseFileTable.cpp b/src/SBaseFileTable.cpp
index a579fbd..2fd717b 100644
--- a/src/SBaseFileTable.cpp
+++ b/src/SBaseFileTable.cpp
@@ -651,7 +651,6 @@ DWORD ConvertMpqHeaderToFormat4(
 
             // Verify header MD5. Header MD5 is calculated from the MPQ header since the 'MPQ\x1A'
             // signature until the position of header MD5 at offset 0xC0
-            BSWAP_TMPQHEADER(pHeader, MPQ_FORMAT_VERSION_4);
 
             // Apparently, Starcraft II only accepts MPQ headers where the MPQ header hash matches
             // If MD5 doesn't match, we ignore this offset. We also ignore it if there's no MD5 at all
@@ -660,6 +659,9 @@ DWORD ConvertMpqHeaderToFormat4(
             if(!VerifyDataBlockHash(pHeader, MPQ_HEADER_SIZE_V4 - MD5_DIGEST_SIZE, pHeader->MD5_MpqHeader))
                 return ERROR_FAKE_MPQ_HEADER;
 
+            // Byteswap after header MD5 is verified
+            BSWAP_TMPQHEADER(pHeader, MPQ_FORMAT_VERSION_4);
+
             // HiBlockTable must be 0 for archives under 4GB
             if((pHeader->ArchiveSize64 >> 0x20) == 0 && pHeader->HiBlockTablePos64 != 0)
                 return ERROR_FAKE_MPQ_HEADER;