diff --git a/TechnitiumLibrary.Security.Cryptography/PBKDF2.cs b/TechnitiumLibrary.Security.Cryptography/PBKDF2.cs
index b0199d5d..cfaf4b0e 100644
--- a/TechnitiumLibrary.Security.Cryptography/PBKDF2.cs
+++ b/TechnitiumLibrary.Security.Cryptography/PBKDF2.cs
@@ -55,7 +55,7 @@ public static PBKDF2 CreateHMACSHA1(string password, byte[] salt, int iterationC
 
         public static PBKDF2 CreateHMACSHA1(byte[] password, byte[] salt, int iterationCount)
         {
-            return new PBKDF2(new HMACSHA256(password), salt, iterationCount);
+            return new PBKDF2(new HMACSHA1(password), salt, iterationCount);
         }
 
         public static PBKDF2 CreateHMACSHA1(string password, int saltLength, int iterationCount)