diff --git a/.changes/unreleased/Fixes-20241112-141109.yaml b/.changes/unreleased/Fixes-20241112-141109.yaml
new file mode 100644
index 00000000..46df4e48
--- /dev/null
+++ b/.changes/unreleased/Fixes-20241112-141109.yaml
@@ -0,0 +1,6 @@
+kind: Fixes
+body: Negate the check for microbatch behavior flag in determining builtins
+time: 2024-11-12T14:11:09.341634-06:00
+custom:
+  Author: QMalcolm
+  Issue: 349
diff --git a/dbt/adapters/base/impl.py b/dbt/adapters/base/impl.py
index c8457e2f..752389c1 100644
--- a/dbt/adapters/base/impl.py
+++ b/dbt/adapters/base/impl.py
@@ -1579,7 +1579,7 @@ def valid_incremental_strategies(self):
 
     def builtin_incremental_strategies(self):
         builtin_strategies = ["append", "delete+insert", "merge", "insert_overwrite"]
-        if self.behavior.require_batched_execution_for_custom_microbatch_strategy.no_warn:
+        if not self.behavior.require_batched_execution_for_custom_microbatch_strategy.no_warn:
             builtin_strategies.append("microbatch")
 
         return builtin_strategies