diff --git a/tests/qemu-iotests/242 b/tests/qemu-iotests/242
index 547bf382e3..b3afd36d72 100755
--- a/tests/qemu-iotests/242
+++ b/tests/qemu-iotests/242
@@ -100,7 +100,7 @@ add_bitmap(1, True, False)
 log('Write an unknown bitmap flag \'{}\' into a new QCOW2 image at offset {}'
     .format(hex(bitmap_flag_unknown), flag_offset))
 toggle_flag(flag_offset)
-img_info_log(disk)
+img_info_log(disk, check=False)
 toggle_flag(flag_offset)
 log('Unset the unknown bitmap flag \'{}\' in the bitmap directory entry:\n'
     .format(hex(bitmap_flag_unknown)))
diff --git a/tests/qemu-iotests/266 b/tests/qemu-iotests/266
index 71ce81d0df..8fc3807ac5 100755
--- a/tests/qemu-iotests/266
+++ b/tests/qemu-iotests/266
@@ -137,7 +137,7 @@ def main():
             iotests.log('')
 
             vm.shutdown()
-            iotests.img_info_log(file_path)
+            iotests.img_info_log(file_path, check=False)
 
 
 iotests.script_main(main,
diff --git a/tests/qemu-iotests/iotests.py b/tests/qemu-iotests/iotests.py
index 1771d01977..4b788c7491 100644
--- a/tests/qemu-iotests/iotests.py
+++ b/tests/qemu-iotests/iotests.py
@@ -312,13 +312,15 @@ def qemu_img_info(*args: str) -> Any:
 def qemu_img_map(*args: str) -> Any:
     return qemu_img_json('map', "--output", "json", *args)
 
-def qemu_img_log(*args: str) -> 'subprocess.CompletedProcess[str]':
-    result = qemu_img(*args, check=False)
+def qemu_img_log(*args: str, check: bool = True
+                 ) -> 'subprocess.CompletedProcess[str]':
+    result = qemu_img(*args, check=check)
     log(result.stdout, filters=[filter_testfiles])
     return result
 
 def img_info_log(filename: str, filter_path: Optional[str] = None,
                  use_image_opts: bool = False, extra_args: Sequence[str] = (),
+                 check: bool = True,
                  ) -> None:
     args = ['info']
     if use_image_opts:
@@ -328,7 +330,7 @@ def img_info_log(filename: str, filter_path: Optional[str] = None,
     args += extra_args
     args.append(filename)
 
-    output = qemu_img(*args, check=False).stdout
+    output = qemu_img(*args, check=check).stdout
     if not filter_path:
         filter_path = filename
     log(filter_img_info(output, filter_path))