diff --git a/pdd/fix_error_loop.py b/pdd/fix_error_loop.py
index e719f068e..551dccf3f 100644
--- a/pdd/fix_error_loop.py
+++ b/pdd/fix_error_loop.py
@@ -195,7 +195,7 @@ def _normalize_agentic_result(result):
     # Fallback (shouldn't happen)
     return False, "Invalid agentic result shape", 0.0, "agentic-cli", []
 
-def _safe_run_agentic_fix(*, prompt_file, code_file, unit_test_file, error_log_file, cwd=None):
+def _safe_run_agentic_fix(*, prompt_file, code_file, unit_test_file, error_log_file, cwd=None, protect_tests: bool = False):
     """
     Call (possibly monkeypatched) run_agentic_fix and normalize its return.
     """
@@ -205,6 +205,7 @@ def _safe_run_agentic_fix(*, prompt_file, code_file, unit_test_file, error_log_f
         unit_test_file=unit_test_file,
         error_log_file=error_log_file,
         cwd=cwd,
+        protect_tests=protect_tests,
     )
     return _normalize_agentic_result(res)
 # ---------------------------------------------------------------------
@@ -424,6 +425,7 @@ def fix_error_loop(unit_test_file: str,
                     unit_test_file=unit_test_file,
                     error_log_file=error_log_file,
                     cwd=None,  # Use project root (cwd), not prompt file's parent
+                    protect_tests=protect_tests,
                 )
                 if not success:
                     rprint(f"[bold red]Agentic fix fallback failed: {agent_msg}[/bold red]")
@@ -481,6 +483,7 @@ def fix_error_loop(unit_test_file: str,
                 unit_test_file=unit_test_file,
                 error_log_file=error_log_file,
                 cwd=None,
+                protect_tests=protect_tests,
             )
             if not success:
                 rprint(f"[bold red]Agentic fix fallback failed: {agent_msg}[/bold red]")
@@ -521,6 +524,7 @@ def fix_error_loop(unit_test_file: str,
                 unit_test_file=unit_test_file,
                 error_log_file=error_log_file,
                 cwd=None,  # Use project root (cwd), not prompt file's parent
+                protect_tests=protect_tests,
             )
             if not success:
                 rprint(f"[bold red]Agentic fix fallback failed: {agent_msg}[/bold red]")
@@ -998,6 +1002,7 @@ def fix_error_loop(unit_test_file: str,
             unit_test_file=unit_test_file,
             error_log_file=error_log_file,
             cwd=None,  # Use project root (cwd), not prompt file's parent
+            protect_tests=protect_tests,
         )
         total_cost += agent_cost
         if not agent_success:
diff --git a/tests/test_fix_error_loop.py b/tests/test_fix_error_loop.py
index d5c94e50d..aa2da980a 100644
--- a/tests/test_fix_error_loop.py
+++ b/tests/test_fix_error_loop.py
@@ -13,6 +13,7 @@
     run_pytest_on_file,
     format_log_for_output,
     _normalize_agentic_result,
+    _safe_run_agentic_fix,
     escape_brackets
 )
 
@@ -1744,6 +1745,25 @@ def test_protect_tests_prevents_unit_test_write(mock_subprocess, mock_fix, mock_
             "Test file should NOT be modified when protect_tests=True"
 
 
+@patch("pdd.fix_error_loop.run_agentic_fix")
+def test_safe_run_agentic_fix_preserves_protect_tests_flag(mock_run_agentic_fix):
+    """Regression test: agentic fallback must receive protect_tests from fix_error_loop."""
+    mock_run_agentic_fix.return_value = (True, "ok", 0.0, "agentic-cli", [])
+
+    _safe_run_agentic_fix(
+        prompt_file="prompt.txt",
+        code_file="code.py",
+        unit_test_file="test.py",
+        error_log_file="error.log",
+        cwd=".",
+        protect_tests=True,
+    )
+
+    mock_run_agentic_fix.assert_called_once()
+    _, kwargs = mock_run_agentic_fix.call_args
+    assert kwargs["protect_tests"] is True, "protect_tests should be forwarded to run_agentic_fix"
+
+
 # ============================================================================
 # Bug Fix Tests - Issue #485: Warnings block success gate
 # ============================================================================