diff --git a/bigquery/schema.go b/bigquery/schema.go
index dcb5c6f9b77..0bcd85a606c 100644
--- a/bigquery/schema.go
+++ b/bigquery/schema.go
@@ -206,10 +206,12 @@ var (
 	}
 	// The API will accept alias names for the types based on the Standard SQL type names.
 	fieldAliases = map[FieldType]FieldType{
-		"BOOL":    BooleanFieldType,
-		"FLOAT64": FloatFieldType,
-		"INT64":   IntegerFieldType,
-		"STRUCT":  RecordFieldType,
+		"BOOL":       BooleanFieldType,
+		"FLOAT64":    FloatFieldType,
+		"INT64":      IntegerFieldType,
+		"STRUCT":     RecordFieldType,
+		"DECIMAL":    NumericFieldType,
+		"BIGDECIMAL": BigNumericFieldType,
 	}
 )
 
diff --git a/bigquery/schema_test.go b/bigquery/schema_test.go
index ae936980c78..6bdbf13858d 100644
--- a/bigquery/schema_test.go
+++ b/bigquery/schema_test.go
@@ -1047,7 +1047,8 @@ func TestSchemaFromJSON(t *testing.T) {
 	{"name":"aliased_integer","type":"INT64","mode":"REQUIRED","description":"Aliased required integer"},
 	{"name":"aliased_boolean","type":"BOOL","mode":"NULLABLE","description":"Aliased nullable boolean"},
 	{"name":"aliased_float","type":"FLOAT64","mode":"REQUIRED","description":"Aliased required float"},
-	{"name":"aliased_record","type":"STRUCT","mode":"NULLABLE","description":"Aliased nullable record"}
+	{"name":"aliased_record","type":"STRUCT","mode":"NULLABLE","description":"Aliased nullable record"},
+	{"name":"aliased_bignumeric","type":"BIGDECIMAL","mode":"NULLABLE","description":"Aliased nullable bignumeric"}
 ]`),
 			expectedSchema: Schema{
 				fieldSchema("Flat nullable string", "flat_string", "STRING", false, false, nil),
@@ -1066,6 +1067,7 @@ func TestSchemaFromJSON(t *testing.T) {
 				fieldSchema("Aliased nullable boolean", "aliased_boolean", "BOOLEAN", false, false, nil),
 				fieldSchema("Aliased required float", "aliased_float", "FLOAT", false, true, nil),
 				fieldSchema("Aliased nullable record", "aliased_record", "RECORD", false, false, nil),
+				fieldSchema("Aliased nullable bignumeric", "aliased_bignumeric", "BIGNUMERIC", false, false, nil),
 			},
 		},
 		{