diff --git a/include/aaruformat/enums.h b/include/aaruformat/enums.h
index c0a6ee7..fe2b3ef 100644
--- a/include/aaruformat/enums.h
+++ b/include/aaruformat/enums.h
@@ -141,6 +141,7 @@ typedef enum
     DataBlock                    = 0x4B4C4244,  ///< Block containing data.
     DeDuplicationTable           = 0x2A544444,  ///< Block containing a deduplication table (v1).
     DeDuplicationTable2          = 0x32544444,  ///< Block containing a deduplication table v2.
+    DeDuplicationTableSecondary  = 0x53545444,  ///< Block containing a secondary deduplication table (v2).
     IndexBlock                   = 0x58444E49,  ///< Block containing the index (v1).
     IndexBlock2                  = 0x32584449,  ///< Block containing the index v2.
     IndexBlock3                  = 0x33584449,  ///< Block containing the index v3.
diff --git a/src/close.c b/src/close.c
index be4c208..4d3869c 100644
--- a/src/close.c
+++ b/src/close.c
@@ -106,7 +106,7 @@ static int32_t write_cached_secondary_ddt(aaruformat_context *ctx)
 
     // Prepare DDT header for the cached table
     DdtHeader2 ddt_header          = {0};
-    ddt_header.identifier          = DeDuplicationTable2;
+    ddt_header.identifier          = DeDuplicationTableSecondary;
     ddt_header.type                = UserData;
     ddt_header.compression         = ctx->compression_enabled ? Lzma : None;
     ddt_header.levels              = ctx->user_data_ddt_header.levels;
@@ -208,7 +208,8 @@ static int32_t write_cached_secondary_ddt(aaruformat_context *ctx)
                 for(unsigned int k = 0; k < utarray_len(ctx->index_entries); k++)
                 {
                     entry = (IndexEntry *)utarray_eltptr(ctx->index_entries, k);
-                    if(entry && entry->offset == ctx->cached_ddt_offset && entry->blockType == DeDuplicationTable2)
+                    if(entry && entry->offset == ctx->cached_ddt_offset &&
+                       entry->blockType == DeDuplicationTableSecondary)
                     {
                         TRACE("Found old DDT index entry at position %u, removing", k);
                         utarray_erase(ctx->index_entries, k, 1);
@@ -219,7 +220,7 @@ static int32_t write_cached_secondary_ddt(aaruformat_context *ctx)
 
             // Add new index entry for the newly written secondary DDT
             IndexEntry new_ddt_entry;
-            new_ddt_entry.blockType = DeDuplicationTable2;
+            new_ddt_entry.blockType = DeDuplicationTableSecondary;
             new_ddt_entry.dataType  = UserData;
             new_ddt_entry.offset    = end_of_file;
 
diff --git a/src/ddt/ddt_v2.c b/src/ddt/ddt_v2.c
index f84fda8..66b43db 100644
--- a/src/ddt/ddt_v2.c
+++ b/src/ddt/ddt_v2.c
@@ -1202,7 +1202,7 @@ bool set_ddt_multi_level_v2(aaruformat_context *ctx, uint64_t sector_address, bo
 
             // Prepare DDT header for the never-written cached table
             memset(&ddt_header, 0, sizeof(DdtHeader2));
-            ddt_header.identifier  = DeDuplicationTable2;
+            ddt_header.identifier  = DeDuplicationTableSecondary;
             ddt_header.type        = UserData;
             ddt_header.compression = ctx->compression_enabled ? Lzma : None;  // Use no compression for simplicity
             ddt_header.levels      = ctx->user_data_ddt_header.levels;
@@ -1303,7 +1303,7 @@ bool set_ddt_multi_level_v2(aaruformat_context *ctx, uint64_t sector_address, bo
 
             // Add index entry for the newly written secondary DDT
             IndexEntry new_ddt_entry;
-            new_ddt_entry.blockType = DeDuplicationTable2;
+            new_ddt_entry.blockType = DeDuplicationTableSecondary;
             new_ddt_entry.dataType  = UserData;
             new_ddt_entry.offset    = end_of_file;
 
@@ -1376,7 +1376,7 @@ bool set_ddt_multi_level_v2(aaruformat_context *ctx, uint64_t sector_address, bo
 
         // Prepare DDT header for the cached table
         memset(&ddt_header, 0, sizeof(DdtHeader2));
-        ddt_header.identifier          = DeDuplicationTable2;
+        ddt_header.identifier          = DeDuplicationTableSecondary;
         ddt_header.type                = UserData;
         ddt_header.compression         = ctx->compression_enabled ? Lzma : None;
         ddt_header.levels              = ctx->user_data_ddt_header.levels;
@@ -1489,7 +1489,7 @@ bool set_ddt_multi_level_v2(aaruformat_context *ctx, uint64_t sector_address, bo
             for(unsigned int i = 0; i < utarray_len(ctx->index_entries); i++)
             {
                 entry = (IndexEntry *)utarray_eltptr(ctx->index_entries, i);
-                if(entry && entry->offset == ctx->cached_ddt_offset && entry->blockType == DeDuplicationTable2)
+                if(entry && entry->offset == ctx->cached_ddt_offset && entry->blockType == DeDuplicationTableSecondary)
                 {
                     TRACE("Found old DDT index entry at position %u, removing", i);
                     utarray_erase(ctx->index_entries, i, 1);
@@ -1500,7 +1500,7 @@ bool set_ddt_multi_level_v2(aaruformat_context *ctx, uint64_t sector_address, bo
 
         // Add new index entry for the newly written secondary DDT
         IndexEntry new_ddt_entry;
-        new_ddt_entry.blockType = DeDuplicationTable2;
+        new_ddt_entry.blockType = DeDuplicationTableSecondary;
         new_ddt_entry.dataType  = UserData;
         new_ddt_entry.offset    = end_of_file;