diff --git a/dvc/schema.py b/dvc/schema.py
index 849b318fd..c1e2b9cc5 100644
--- a/dvc/schema.py
+++ b/dvc/schema.py
@@ -17,7 +17,6 @@ from dvc.stage.params import StageParams
 STAGES = "stages"
 SINGLE_STAGE_SCHEMA = {
     StageParams.PARAM_MD5: output.CHECKSUM_SCHEMA,
-    StageParams.PARAM_CMD: Any(str, list, None),
     StageParams.PARAM_WDIR: Any(str, None),
     StageParams.PARAM_DEPS: Any([dependency.SCHEMA], None),
     StageParams.PARAM_OUTS: Any([output.SCHEMA], None),
diff --git a/tests/func/test_stage.py b/tests/func/test_stage.py
index 0030727be..261b53479 100644
--- a/tests/func/test_stage.py
+++ b/tests/func/test_stage.py
@@ -20,18 +20,10 @@ def test_cmd_obj():
         SingleStageFile.validate({Stage.PARAM_CMD: {}})
 
 
-def test_cmd_none():
-    SingleStageFile.validate({Stage.PARAM_CMD: None})
-
-
 def test_no_cmd():
     SingleStageFile.validate({})
 
 
-def test_cmd_str():
-    SingleStageFile.validate({Stage.PARAM_CMD: "cmd"})
-
-
 def test_object():
     with pytest.raises(YAMLValidationError):
         SingleStageFile.validate({Stage.PARAM_DEPS: {}})