diff --git a/src/main/java/JettyLauncher.java b/src/main/java/JettyLauncher.java
index 1c2b6ca..36c28e7 100644
--- a/src/main/java/JettyLauncher.java
+++ b/src/main/java/JettyLauncher.java
@@ -50,9 +50,6 @@
                         case "--plugin_dir":
                             System.setProperty("gitbucket.pluginDir", dim[1]);
                             break;
-                        case "--validate_password":
-                            System.setProperty("gitbucket.validate.password", dim[1]);
-                            break;
                     }
                 }
             }
diff --git a/src/main/scala/gitbucket/core/controller/AccountController.scala b/src/main/scala/gitbucket/core/controller/AccountController.scala
index 2c9bfa4..40bd892 100644
--- a/src/main/scala/gitbucket/core/controller/AccountController.scala
+++ b/src/main/scala/gitbucket/core/controller/AccountController.scala
@@ -82,7 +82,7 @@
 
   val newForm = mapping(
     "userName" -> trim(label("User name", text(required, maxlength(100), identifier, uniqueUserName, reservedNames))),
-    "password" -> trim(label("Password", text(required, maxlength(20), password))),
+    "password" -> trim(label("Password", text(required, maxlength(20)))),
     "fullName" -> trim(label("Full Name", text(required, maxlength(100)))),
     "mailAddress" -> trim(label("Mail Address", text(required, maxlength(100), uniqueMailAddress()))),
     "extraMailAddresses" -> list(
@@ -94,7 +94,7 @@
   )(AccountNewForm.apply)
 
   val editForm = mapping(
-    "password" -> trim(label("Password", optional(text(maxlength(20), password)))),
+    "password" -> trim(label("Password", optional(text(maxlength(20))))),
     "fullName" -> trim(label("Full Name", text(required, maxlength(100)))),
     "mailAddress" -> trim(label("Mail Address", text(required, maxlength(100), uniqueMailAddress("userName")))),
     "extraMailAddresses" -> list(
diff --git a/src/main/scala/gitbucket/core/controller/SystemSettingsController.scala b/src/main/scala/gitbucket/core/controller/SystemSettingsController.scala
index b105aa0..b51b227 100644
--- a/src/main/scala/gitbucket/core/controller/SystemSettingsController.scala
+++ b/src/main/scala/gitbucket/core/controller/SystemSettingsController.scala
@@ -177,7 +177,7 @@
 
   val newUserForm = mapping(
     "userName" -> trim(label("Username", text(required, maxlength(100), identifier, uniqueUserName, reservedNames))),
-    "password" -> trim(label("Password", text(required, maxlength(20), password))),
+    "password" -> trim(label("Password", text(required, maxlength(20)))),
     "fullName" -> trim(label("Full Name", text(required, maxlength(100)))),
     "mailAddress" -> trim(label("Mail Address", text(required, maxlength(100), uniqueMailAddress()))),
     "extraMailAddresses" -> list(
@@ -191,7 +191,7 @@
 
   val editUserForm = mapping(
     "userName" -> trim(label("Username", text(required, maxlength(100), identifier))),
-    "password" -> trim(label("Password", optional(text(maxlength(20), password)))),
+    "password" -> trim(label("Password", optional(text(maxlength(20))))),
     "fullName" -> trim(label("Full Name", text(required, maxlength(100)))),
     "mailAddress" -> trim(label("Mail Address", text(required, maxlength(100), uniqueMailAddress("userName")))),
     "extraMailAddresses" -> list(
diff --git a/src/main/scala/gitbucket/core/util/Validations.scala b/src/main/scala/gitbucket/core/util/Validations.scala
index 65082de..b29937c 100644
--- a/src/main/scala/gitbucket/core/util/Validations.scala
+++ b/src/main/scala/gitbucket/core/util/Validations.scala
@@ -20,21 +20,6 @@
   }
 
   /**
-   * Constraint for the password.
-   */
-  val password: Constraint = new Constraint() {
-    lazy val validatePassword = ConfigUtil.getConfigValue[Boolean]("gitbucket.validate.password").getOrElse(true)
-
-    override def validate(name: String, value: String, messages: Messages): Option[String] = {
-      if (validatePassword == true && !value.matches("[a-zA-Z0-9\\-_.]+")) {
-        Some(s"${name} contains invalid character.")
-      } else {
-        None
-      }
-    }
-  }
-
-  /**
    * Constraint for the repository identifier.
    */
   val repository: Constraint = new Constraint() {