diff --git a/Adler32Context.cs b/Adler32Context.cs
index 1b1103c..e03f763 100644
--- a/Adler32Context.cs
+++ b/Adler32Context.cs
@@ -137,6 +137,8 @@ namespace DiscImageChef.Checksums
                 adlerOutput.Append(hash[i].ToString("x2"));
             }
 
+            fileStream.Close();
+
             return adlerOutput.ToString();
         }
 
diff --git a/CRC16Context.cs b/CRC16Context.cs
index 1ab16d1..adbfe49 100644
--- a/CRC16Context.cs
+++ b/CRC16Context.cs
@@ -163,6 +163,8 @@ namespace DiscImageChef.Checksums
                 crc16Output.Append(hash[i].ToString("x2"));
             }
 
+            fileStream.Close();
+
             return crc16Output.ToString();
         }
 
diff --git a/CRC32Context.cs b/CRC32Context.cs
index b560b94..69d0dc1 100644
--- a/CRC32Context.cs
+++ b/CRC32Context.cs
@@ -163,6 +163,8 @@ namespace DiscImageChef.Checksums
                 crc32Output.Append(hash[i].ToString("x2"));
             }
 
+            fileStream.Close();
+
             return crc32Output.ToString();
         }
 
diff --git a/CRC64Context.cs b/CRC64Context.cs
index 10b616a..7e7d8e1 100644
--- a/CRC64Context.cs
+++ b/CRC64Context.cs
@@ -163,6 +163,8 @@ namespace DiscImageChef.Checksums
                 crc64Output.Append(hash[i].ToString("x2"));
             }
 
+            fileStream.Close();
+
             return crc64Output.ToString();
         }
 
diff --git a/MD5Context.cs b/MD5Context.cs
index 9f6614c..b1e50f8 100644
--- a/MD5Context.cs
+++ b/MD5Context.cs
@@ -102,7 +102,9 @@ namespace DiscImageChef.Checksums
         public byte[] File(string filename)
         {
             FileStream fileStream = new FileStream(filename, FileMode.Open);
-            return _md5Provider.ComputeHash(fileStream);
+            byte[] result = _md5Provider.ComputeHash(fileStream);
+            fileStream.Close();
+            return result;
         }
 
         /// <summary>
@@ -121,6 +123,8 @@ namespace DiscImageChef.Checksums
                 md5Output.Append(hash[i].ToString("x2"));
             }
 
+            fileStream.Close();
+
             return md5Output.ToString();
         }
 
diff --git a/RIPEMD160Context.cs b/RIPEMD160Context.cs
index f18f31e..5fb43a2 100644
--- a/RIPEMD160Context.cs
+++ b/RIPEMD160Context.cs
@@ -102,7 +102,9 @@ namespace DiscImageChef.Checksums
         public byte[] File(string filename)
         {
             FileStream fileStream = new FileStream(filename, FileMode.Open);
-            return _ripemd160Provider.ComputeHash(fileStream);
+            byte[] result = _ripemd160Provider.ComputeHash(fileStream);
+            fileStream.Close();
+            return result;
         }
 
         /// <summary>
@@ -121,6 +123,8 @@ namespace DiscImageChef.Checksums
                 ripemd160Output.Append(hash[i].ToString("x2"));
             }
 
+            fileStream.Close();
+
             return ripemd160Output.ToString();
         }
 
diff --git a/SHA1Context.cs b/SHA1Context.cs
index 658ee5f..b79e7ee 100644
--- a/SHA1Context.cs
+++ b/SHA1Context.cs
@@ -102,7 +102,9 @@ namespace DiscImageChef.Checksums
         public byte[] File(string filename)
         {
             FileStream fileStream = new FileStream(filename, FileMode.Open);
-            return _sha1Provider.ComputeHash(fileStream);
+            byte[] result = _sha1Provider.ComputeHash(fileStream);
+            fileStream.Close();
+            return result;
         }
 
         /// <summary>
@@ -121,6 +123,8 @@ namespace DiscImageChef.Checksums
                 sha1Output.Append(hash[i].ToString("x2"));
             }
 
+            fileStream.Close();
+
             return sha1Output.ToString();
         }
 
diff --git a/SHA256Context.cs b/SHA256Context.cs
index ba65509..cb8c406 100644
--- a/SHA256Context.cs
+++ b/SHA256Context.cs
@@ -102,7 +102,9 @@ namespace DiscImageChef.Checksums
         public byte[] File(string filename)
         {
             FileStream fileStream = new FileStream(filename, FileMode.Open);
-            return _sha256Provider.ComputeHash(fileStream);
+            byte[] result = _sha256Provider.ComputeHash(fileStream);
+            fileStream.Close();
+            return result;
         }
 
         /// <summary>
@@ -121,6 +123,8 @@ namespace DiscImageChef.Checksums
                 sha256Output.Append(hash[i].ToString("x2"));
             }
 
+            fileStream.Close();
+
             return sha256Output.ToString();
         }
 
diff --git a/SHA384Context.cs b/SHA384Context.cs
index 50d31c8..95852ef 100644
--- a/SHA384Context.cs
+++ b/SHA384Context.cs
@@ -102,7 +102,9 @@ namespace DiscImageChef.Checksums
         public byte[] File(string filename)
         {
             FileStream fileStream = new FileStream(filename, FileMode.Open);
-            return _sha384Provider.ComputeHash(fileStream);
+            byte[] result = _sha384Provider.ComputeHash(fileStream);
+            fileStream.Close();
+            return result;
         }
 
         /// <summary>
@@ -121,6 +123,8 @@ namespace DiscImageChef.Checksums
                 sha384Output.Append(hash[i].ToString("x2"));
             }
 
+            fileStream.Close();
+
             return sha384Output.ToString();
         }
 
diff --git a/SHA512Context.cs b/SHA512Context.cs
index fe7cd08..fc50fc5 100644
--- a/SHA512Context.cs
+++ b/SHA512Context.cs
@@ -102,7 +102,9 @@ namespace DiscImageChef.Checksums
         public byte[] File(string filename)
         {
             FileStream fileStream = new FileStream(filename, FileMode.Open);
-            return _sha512Provider.ComputeHash(fileStream);
+            byte[] result = _sha512Provider.ComputeHash(fileStream);
+            fileStream.Close();
+            return result;
         }
 
         /// <summary>
@@ -121,6 +123,8 @@ namespace DiscImageChef.Checksums
                 sha512Output.Append(hash[i].ToString("x2"));
             }
 
+            fileStream.Close();
+
             return sha512Output.ToString();
         }