diff --git a/AspNetCore.Security.Jwt/SecurityExtensions.cs b/AspNetCore.Security.Jwt/SecurityExtensions.cs
index b7fa697..cc8af5f 100644
--- a/AspNetCore.Security.Jwt/SecurityExtensions.cs
+++ b/AspNetCore.Security.Jwt/SecurityExtensions.cs
@@ -62,7 +62,7 @@ public static IServiceCollection AddSecurity<TAuthenticator>(this IServiceCollec
         /// <returns>The services collection</returns>
         public static IServiceCollection AddSecurity<TAuthenticator, TUserModel>(this IServiceCollection services,
                                                                 IConfiguration configuration,
-                                                                Action<IIdTypeBuilder<TUserModel>> addClaims,
+                                                                Action<IIdTypeBuilder<TUserModel>> addClaims = null,
                                                                 bool addSwaggerSecurity = false)
             where TAuthenticator : class, IAuthentication<TUserModel>
             where TUserModel : class, IAuthenticationUser
@@ -73,7 +73,10 @@ public static IServiceCollection AddSecurity<TAuthenticator, TUserModel>(this IS
 
             services.AddSingleton(securitySettings);
             services.AddSingleton<BaseSecuritySettings>(securitySettings);
-            services.AddSingleton<Action<IIdTypeBuilder<TUserModel>>>(x => addClaims);
+            if (addClaims != null)
+            {
+                services.AddSingleton<Action<IIdTypeBuilder<TUserModel>>>(x => addClaims);
+            }
             services.AddScoped<ISecurityService<TUserModel>, SecurityService<TUserModel>>();
             services.AddScoped<IAuthentication<TUserModel>, TAuthenticator>();
 
@@ -101,7 +104,7 @@ public static IServiceCollection AddSecurity<TAuthenticator, TUserModel>(this IS
         /// <returns>The services collection</returns>
         public static IServiceCollection AddFacebookSecurity(this IServiceCollection services,
                                                                 IConfiguration configuration,
-                                                                Action<IIdTypeBuilder<FacebookAuthModel>> addClaims,
+                                                                Action<IIdTypeBuilder<FacebookAuthModel>> addClaims = null,
                                                                 bool addSwaggerSecurity = false)
         {
             var securitySettings = new FacebookSecuritySettings();
@@ -110,7 +113,10 @@ public static IServiceCollection AddFacebookSecurity(this IServiceCollection ser
 
             services.AddSingleton(securitySettings);
             services.AddSingleton<BaseSecuritySettings>(securitySettings);
-            services.AddSingleton<Action<IIdTypeBuilder<FacebookAuthModel>>>(x => addClaims);
+            if (addClaims != null)
+            {
+                services.AddSingleton<Action<IIdTypeBuilder<FacebookAuthModel>>>(x => addClaims);
+            }
             services.AddScoped<ISecurityService<FacebookAuthModel>, SecurityService<FacebookAuthModel>>();           
             services.AddScoped<IAuthentication<FacebookAuthModel>, FacebookAuthenticator>();
 
diff --git a/AspNetCore.Security.Jwt/SecurityService.cs b/AspNetCore.Security.Jwt/SecurityService.cs
index af66c0a..cf2a034 100644
--- a/AspNetCore.Security.Jwt/SecurityService.cs
+++ b/AspNetCore.Security.Jwt/SecurityService.cs
@@ -66,7 +66,7 @@ internal class SecurityService<TUserModel> : ISecurityService<TUserModel>
         private Action<IIdTypeBuilder<TUserModel>> addClaims;
         const double DEFAULT_TOKEN_EXPIRY_IN_HOURS = 1;        
 
-        public SecurityService(BaseSecuritySettings securitySettings, Action<IIdTypeBuilder<TUserModel>> addClaims)
+        public SecurityService(BaseSecuritySettings securitySettings, Action<IIdTypeBuilder<TUserModel>> addClaims = null)
         {
             this.securitySettings = securitySettings;
             this.addClaims = addClaims;
@@ -81,14 +81,20 @@ public string GenerateToken(TUserModel user)
 
             var builder = new IdTypeBuilder<TUserModel>(user);
 
-            this.addClaims(builder);
+            if (addClaims != null)
+            {
+                this.addClaims(builder);
+            }
 
             var claims = new List<Claim> {
                 new Claim(JwtRegisteredClaimNames.Exp, $"{new DateTimeOffset(DateTime.Now.AddHours(this.securitySettings.TokenExpiryInHours ?? DEFAULT_TOKEN_EXPIRY_IN_HOURS)).ToUnixTimeSeconds()}"),
                 new Claim(JwtRegisteredClaimNames.Nbf, $"{new DateTimeOffset(DateTime.Now).ToUnixTimeSeconds()}")
             };
 
-            claims.AddRange(builder.ToClaims());
+            if (addClaims != null)
+            {
+                claims.AddRange(builder.ToClaims());
+            }
 
             var token = new JwtSecurityToken(
                 issuer: this.securitySettings.Issuer,