diff --git a/ci/run_scheduled_sanitizer_test.py b/ci/run_scheduled_sanitizer_test.py
index 6696e184c287cc2a7785e3a251695a402d24ff1e..d2483627dfccf573d371eb349c125b76eb8313d4 100644
--- a/ci/run_scheduled_sanitizer_test.py
+++ b/ci/run_scheduled_sanitizer_test.py
@@ -42,12 +42,12 @@ def get_modes(in_format: str) -> list:
     list_process = subprocess.run(cmd, capture_output=True)
 
     output = list_process.stdout.decode("utf8")
+    mode_list = output.splitlines()
 
     # correction for multichannel modes to avoid selecting some mono modes...
     if in_format in MC_MODES:
         in_format = "MC_" + in_format + "_b"
-
-    mode_list = [m for m in output.splitlines() if in_format in m]
+        mode_list = [m for m in mode_list if in_format in m]
 
     return mode_list