diff --git a/ddl/column_test.go b/ddl/column_test.go
index 704a61e2d33a3..9053afe395110 100644
--- a/ddl/column_test.go
+++ b/ddl/column_test.go
@@ -922,6 +922,9 @@ func (s *testColumnSuite) TestModifyColumn(c *C) {
 		{"decimal(2,1)", "decimal(3,2)", errUnsupportedModifyColumn.GenWithStackByArgs("can't change decimal column precision")},
 		{"decimal(2,1)", "decimal(2,2)", errUnsupportedModifyColumn.GenWithStackByArgs("can't change decimal column precision")},
 		{"decimal(2,1)", "decimal(2,1)", nil},
+		{"decimal(2,1)", "int", errUnsupportedModifyColumn.GenWithStackByArgs("type int(11) not match origin decimal(2,1)")},
+		{"decimal", "int", errUnsupportedModifyColumn.GenWithStackByArgs("type int(11) not match origin decimal(11,0)")},
+		{"decimal(2,1)", "bigint", errUnsupportedModifyColumn.GenWithStackByArgs("type bigint(20) not match origin decimal(2,1)")},
 	}
 	for _, tt := range tests {
 		ftA := s.colDefStrToFieldType(c, tt.origin)
diff --git a/ddl/ddl_api.go b/ddl/ddl_api.go
index 5472fb1947069..bcb4ffce248a1 100644
--- a/ddl/ddl_api.go
+++ b/ddl/ddl_api.go
@@ -2469,6 +2469,9 @@ func modifiable(origin *types.FieldType, to *types.FieldType) error {
 			}
 		}
 	case mysql.TypeNewDecimal:
+		if origin.Tp != to.Tp {
+			return errUnsupportedModifyColumn.GenWithStackByArgs(unsupportedMsg)
+		}
 		// The root cause is modifying decimal precision needs to rewrite binary representation of that decimal.
 		if to.Flen != origin.Flen || to.Decimal != origin.Decimal {
 			return errUnsupportedModifyColumn.GenWithStackByArgs("can't change decimal column precision")