diff --git a/src/dialects/oracle/query-generator.js b/src/dialects/oracle/query-generator.js
index ee1b5775af2b..e4ca7e6f729a 100644
--- a/src/dialects/oracle/query-generator.js
+++ b/src/dialects/oracle/query-generator.js
@@ -887,32 +887,31 @@ export class OracleQueryGenerator extends AbstractQueryGenerator {
       let unsignedTemplate = '';
       if (attribute.type._unsigned) {
         attribute.type._unsigned = false;
-        unsignedTemplate += ` check(${this.quoteIdentifier(attribute.field)} >= 0)`;
+        unsignedTemplate += ` check(${this.quoteIdentifier(options.attributeName)} >= 0)`;
       }
       template = attribute.type.toString();
-      template += unsignedTemplate;
-    } else {
-      template = '';
-    }
-    
 
-    // Blobs/texts cannot have a defaultValue
-    if (
-      attribute.type &&
-      attribute.type !== 'TEXT' &&
-      attribute.type._binary !== true &&
-      Utils.defaultValueSchemable(attribute.defaultValue)
-    ) {
-      template += ` DEFAULT ${this.escape(attribute.defaultValue)}`;
-    }
+      // Blobs/texts cannot have a defaultValue
+      if (
+        attribute.type &&
+        attribute.type !== 'TEXT' &&
+        attribute.type._binary !== true &&
+        Utils.defaultValueSchemable(attribute.defaultValue)
+      ) {
+        template += ` DEFAULT ${this.escape(attribute.defaultValue)}`;
+      }
 
-    if (!attribute.autoIncrement) {
-      // If autoincrement, not null is setted automatically
-      if (attribute.allowNull === false) {
-        template += ' NOT NULL';
-      } else if (!attribute.primaryKey && !Utils.defaultValueSchemable(attribute.defaultValue)) {
-        template += ' NULL';
+      if (!attribute.autoIncrement) {
+        // If autoincrement, not null is set automatically
+        if (attribute.allowNull === false) {
+          template += ' NOT NULL';
+        } else if (!attribute.primaryKey && !Utils.defaultValueSchemable(attribute.defaultValue)) {
+          template += ' NULL';
+        }
       }
+      template += unsignedTemplate;
+    } else {
+      template = '';
     }
 
     if (attribute.unique === true && !attribute.primaryKey) {
diff --git a/test/unit/dialects/oracle/query-generator.test.js b/test/unit/dialects/oracle/query-generator.test.js
new file mode 100644
index 000000000000..a6750d18a4bb
--- /dev/null
+++ b/test/unit/dialects/oracle/query-generator.test.js
@@ -0,0 +1,31 @@
+
+'use strict';
+
+const Support   = require('../../support'),
+  DataTypes = require('sequelize/lib/data-types'),
+  expectsql = Support.expectsql,
+  current   = Support.sequelize,
+  sql       = current.dialect.queryGenerator;
+
+if (current.dialect.name === 'oracle') {
+  describe('createTable', () => {
+    const FooUser = current.define('user', {
+      intCol: {
+        type: DataTypes.INTEGER.UNSIGNED,
+        allowNull: false,
+        defaultValue: 0
+      }
+    }, 
+    {
+      schema: 'foo',
+      timestamps: false
+    });
+
+    describe('[Oracle Specific] QueryGenerator', () => {
+      it('checks for values >=0', () => {
+        expectsql(sql.createTableQuery(FooUser.getTableName(), sql.attributesToSQL(FooUser.rawAttributes), { }), {
+          default: 'BEGIN EXECUTE IMMEDIATE \'CREATE TABLE "foo"."users" ("id" NUMBER(*,0) GENERATED BY DEFAULT ON NULL AS IDENTITY, "intCol" INTEGER DEFAULT 0 NOT NULL check("intCol" >= 0),PRIMARY KEY ("id"))\'; EXCEPTION WHEN OTHERS THEN IF SQLCODE != -955 THEN RAISE; END IF; END;' });
+      });
+    });
+  });
+}
\ No newline at end of file