diff --git a/metafacture-biblio/src/main/java/org/metafacture/biblio/marc21/Marc21Encoder.java b/metafacture-biblio/src/main/java/org/metafacture/biblio/marc21/Marc21Encoder.java
index 3cd536fe..fb8ad50b 100644
--- a/metafacture-biblio/src/main/java/org/metafacture/biblio/marc21/Marc21Encoder.java
+++ b/metafacture-biblio/src/main/java/org/metafacture/biblio/marc21/Marc21Encoder.java
@@ -81,6 +81,7 @@ public final class Marc21Encoder extends
     private State state = State.IN_STREAM;
 
     private boolean generateIdField;
+    private boolean validateLeader = true;
 
     /**
      * Initializes the encoder with MARC 21 constants and charset.
@@ -108,6 +109,18 @@ public void setGenerateIdField(final boolean generateIdField) {
         this.generateIdField = generateIdField;
     }
 
+    /**
+     * Controls whether the leader should be validated.
+     * <p>
+     * The default value of {@code validateLeader} is true.
+     * <p>
+     *
+     * @param validateLeader if false the leader is not validated
+     */
+    public void setValidateLeader(final boolean validateLeader) {
+        this.validateLeader = validateLeader;
+    }
+
     /**
      * Gets the flag to decide whether the ID field is generated.
      *
@@ -259,12 +272,14 @@ private void processLeaderAsSubfields(final String name, final char code) {
     }
 
     private void requireValidCode(final char code, final char[] validCodes) {
-        for (final char validCode: validCodes) {
-            if (validCode == code) {
-                return;
+        if (validateLeader) {
+            for (final char validCode : validCodes) {
+                if (validCode == code) {
+                    return;
+                }
             }
+            throw new FormatException("invalid code '" + code + "'; allowed codes are: " + Arrays.toString(validCodes));
         }
-        throw new FormatException("invalid code '" + code + "'; allowed codes are: " + Arrays.toString(validCodes));
     }
 
     private void processTopLevelLiteral(final String name, final String value) {
diff --git a/metafacture-biblio/src/main/java/org/metafacture/biblio/marc21/MarcXmlEncoder.java b/metafacture-biblio/src/main/java/org/metafacture/biblio/marc21/MarcXmlEncoder.java
index 3113a324..19bc9888 100644
--- a/metafacture-biblio/src/main/java/org/metafacture/biblio/marc21/MarcXmlEncoder.java
+++ b/metafacture-biblio/src/main/java/org/metafacture/biblio/marc21/MarcXmlEncoder.java
@@ -95,6 +95,11 @@ public String close(final Object[] args) {
 
     private static final int LEADER_ENTITY_LENGTH = 5;
 
+    private static final int LEADER_CONCAT_ENTITIES_LENGTH = 8;
+    private static final int LEADER_CONCAT_ENTITIES_POS_04 = 4;
+    private static final int LEADER_CONCAT_ENTITIES_POS_05 = 5;
+    private static final int LEADER_CONCAT_ENTITIES_POS_07 = 7;
+
     private static final int IND1_BEGIN = 3;
     private static final int IND1_END = 4;
     private static final int IND2_BEGIN = 4;
@@ -445,7 +450,12 @@ private void writeLeader() {
                 }
 
                 writeTagLeader(Tag.leader::open);
-                writeRawLeader(leader);
+                if (leader.length() == LEADER_CONCAT_ENTITIES_LENGTH) {
+                    writeRawLeader("0000" + leader.substring(0, LEADER_CONCAT_ENTITIES_POS_04) + "2200000" + leader.substring(LEADER_CONCAT_ENTITIES_POS_05, LEADER_CONCAT_ENTITIES_POS_07) + "4500"); // creates a valid leader without counted elements
+                }
+                else {
+                    writeRawLeader(leader);
+                }
                 writeTagLeader(Tag.leader::close);
 
                 if (formatted) {
diff --git a/metafacture-biblio/src/test/java/org/metafacture/biblio/marc21/Marc21EncoderTest.java b/metafacture-biblio/src/test/java/org/metafacture/biblio/marc21/Marc21EncoderTest.java
index e8e70325..f81d864c 100644
--- a/metafacture-biblio/src/test/java/org/metafacture/biblio/marc21/Marc21EncoderTest.java
+++ b/metafacture-biblio/src/test/java/org/metafacture/biblio/marc21/Marc21EncoderTest.java
@@ -38,6 +38,8 @@
  */
 public final class Marc21EncoderTest {
 
+    private static final String BAD_LEADER = "00600ny  a22002053n 4500";
+
     private Marc21Encoder marc21Encoder;
 
     @Mock
@@ -147,4 +149,21 @@ public void issue524ShouldComputeValidLeader() {
         verify(receiver).process(matches("00055pam a2200037 c 4500021001700000\u001e.*\u001d"));
     }
 
+    @Test(expected = FormatException.class)
+    public void issue567ShouldFailValidateLeaderAsDefault() {
+        marc21Encoder.startRecord("");
+        marc21Encoder.literal(LEADER_ENTITY, BAD_LEADER);
+        marc21Encoder.endRecord();
+    }
+
+    @Test
+    public void issue567ShouldNotValidateLeader() {
+        marc21Encoder.setValidateLeader(false);
+        marc21Encoder.startRecord("");
+        marc21Encoder.literal(LEADER_ENTITY,   BAD_LEADER );
+        marc21Encoder.endRecord();
+
+        verify(receiver).process(matches("00026ny  a22000253n 4500\u001e\u001d"));
+    }
+
 }
diff --git a/metafacture-biblio/src/test/java/org/metafacture/biblio/marc21/MarcXmlEncoderTest.java b/metafacture-biblio/src/test/java/org/metafacture/biblio/marc21/MarcXmlEncoderTest.java
index 2e1c8df2..5d62ff24 100644
--- a/metafacture-biblio/src/test/java/org/metafacture/biblio/marc21/MarcXmlEncoderTest.java
+++ b/metafacture-biblio/src/test/java/org/metafacture/biblio/marc21/MarcXmlEncoderTest.java
@@ -301,13 +301,13 @@ public void issue548_failWhenLeaderIsNotFirst() {
     }
 
     @Test
-    public void issue527_shouldEmitLeaderAlwaysAsWholeString() {
+    public void issue527_shouldEmitLeaderAlwaysAsWholeStringWithAddedDefaultLeaderValuesIfLeaderLengthIs8() {
         createRecordWithLeader("1", "a", "o", "a", " ", "a", "z", "u", " ");
         createRecordWithLeader("2", "d", "u", "m", " ", "m", "y", "#", " ");
         encoder.closeStream();
         String expected = XML_DECLARATION + XML_ROOT_OPEN
-                + "<marc:record><marc:leader>aoa azu </marc:leader></marc:record>"
-                + "<marc:record><marc:leader>dum my# </marc:leader></marc:record>" + XML_MARC_COLLECTION_END_TAG;
+                + "<marc:record><marc:leader>0000aoa 2200000zu4500</marc:leader></marc:record>"
+                + "<marc:record><marc:leader>0000dum 2200000y#4500</marc:leader></marc:record>" + XML_MARC_COLLECTION_END_TAG;
         String actual = resultCollector.toString();
         assertEquals(expected, actual);
     }
@@ -315,7 +315,7 @@ public void issue527_shouldEmitLeaderAlwaysAsWholeString() {
     @Test(expected = MissingIdException.class)
     public void issue527_shouldEmitLeaderAlwaysAsWholeString_ensureCorrectMarc21Xml() {
         encoder.setEnsureCorrectMarc21Xml(true);
-        issue527_shouldEmitLeaderAlwaysAsWholeString();
+        issue527_shouldEmitLeaderAlwaysAsWholeStringWithAddedDefaultLeaderValuesIfLeaderLengthIs8();
     }
 
     @Test