diff --git a/changelog.md b/changelog.md
index bc23f7b6..85bb4d12 100644
--- a/changelog.md
+++ b/changelog.md
@@ -61,6 +61,7 @@ Saves from 4.0.0 are compatible with 4.1.0.
 * **[Mission Generation]** Prevent the creation of a transfer order with 0 units for a rare situtation when a point was captured.
 * **[Mission Generation]** Planned transfers which will be impossible after a base capture will no longer prevent the mission result submit.
 * **[Mission Generation]** Fix occasional KeyError preventing mission generation when all units of the same type in a convoy were killed.
+* **[Mission Generation]** Fix for AAA Flak generator using Opel Blitz preventing the mission from being generated because duplicate unit names were used.
 * **[Mission Generation]** Fixed a potential bug with laser code generation where it would generate invalid codes.  
 * **[UI]** Statistics window tick marks are now always integers.
 * **[UI]** Statistics window now shows the correct info for the turn
diff --git a/gen/sam/aaa_flak.py b/gen/sam/aaa_flak.py
index 0e27a8d2..72f6fb2e 100644
--- a/gen/sam/aaa_flak.py
+++ b/gen/sam/aaa_flak.py
@@ -82,8 +82,10 @@ class FlakGenerator(AirDefenseGroupGenerator):
         )
 
         # Some Opel Blitz trucks
+        index = 0
         for i in range(int(max(1, 2))):
             for j in range(int(max(1, 2))):
+                index += 1
                 self.add_unit(
                     Unarmed.Blitz_36_6700A,
                     "BLITZ#" + str(index),