1 files changed, 2 insertions, 2 deletions
diff --git a/memory.cpp b/memory.cpp
index 3a7697d..28f1797 100644
--- a/memory.cpp
+++ b/memory.cpp
@@ -106,10 +106,10 @@ static uint32
 Memory_Block_PrincipalBitmap_AllocateNew(project_data *File, project_state *State, memory *Memory)
 {
     int h = 0, c = 0, i = 0;
-    int MaxBlockIndex = 0;
+    int MaxBlockIndex = -1;
     while (Block_Loop(Memory, F_Sources, File->Source_Count, &h, &c, &i)) {
         block_source *Source = (block_source *)Memory_Block_AddressAtIndex(Memory, F_Sources, i);
-        if (Source->Bitmap_Index > MaxBlockIndex)
+        if (Source->Bitmap_Index > MaxBlockIndex && Source->Type == source_type_principal)
             MaxBlockIndex = i;
     }