diff --git a/tests/test_b19_headless_reconcile_fixes.py b/tests/test_b19_headless_reconcile_fixes.py
index 4f925cd..36c56c1 100644
--- a/tests/test_b19_headless_reconcile_fixes.py
+++ b/tests/test_b19_headless_reconcile_fixes.py
@@ -88,7 +88,12 @@ def test_bug4_send_keys_safe_gating_order():
     sks_idx = content.find("send_keys_safe() {")
     assert sks_idx != -1
 
-    sks_body = content[sks_idx:sks_idx + 2500]
+    # The whole function body (up to the closing brace at column 0), not a fixed
+    # number of characters: lines added earlier in the function must not push
+    # a later call out of view.
+    sks_end = content.find("\n}\n", sks_idx)
+    assert sks_end != -1
+    sks_body = content[sks_idx:sks_end]
     quiescent_idx = sks_body.find("_pane_quiescent")
     dialog_idx = sks_body.find("_pane_dialog_open")
     prompt_idx = sks_body.find("agent prompt")