diff --git a/Core/src/org/sleuthkit/autopsy/modules/filetypeid/FileTypeIdGlobalSettingsPanel.form b/Core/src/org/sleuthkit/autopsy/modules/filetypeid/FileTypeIdGlobalSettingsPanel.form
index 0cbb98b5e1..e74750378c 100644
--- a/Core/src/org/sleuthkit/autopsy/modules/filetypeid/FileTypeIdGlobalSettingsPanel.form
+++ b/Core/src/org/sleuthkit/autopsy/modules/filetypeid/FileTypeIdGlobalSettingsPanel.form
@@ -360,6 +360,9 @@
           <ResourceString bundle="org/sleuthkit/autopsy/modules/filetypeid/Bundle.properties" key="FileTypeIdGlobalSettingsPanel.deleteSigButton.text" replaceFormat="org.openide.util.NbBundle.getMessage({sourceFileName}.class, &quot;{key}&quot;)"/>
         </Property>
       </Properties>
+      <Events>
+        <EventHandler event="actionPerformed" listener="java.awt.event.ActionListener" parameters="java.awt.event.ActionEvent" handler="deleteSigButtonActionPerformed"/>
+      </Events>
     </Component>
   </SubComponents>
 </Form>
diff --git a/Core/src/org/sleuthkit/autopsy/modules/filetypeid/FileTypeIdGlobalSettingsPanel.java b/Core/src/org/sleuthkit/autopsy/modules/filetypeid/FileTypeIdGlobalSettingsPanel.java
index 97999c0a24..8b7f744a4d 100644
--- a/Core/src/org/sleuthkit/autopsy/modules/filetypeid/FileTypeIdGlobalSettingsPanel.java
+++ b/Core/src/org/sleuthkit/autopsy/modules/filetypeid/FileTypeIdGlobalSettingsPanel.java
@@ -292,6 +292,7 @@ final class FileTypeIdGlobalSettingsPanel extends IngestModuleGlobalSettingsPane
         postHitCheckBox.setSelected(false);
         filesSetNameTextField.setText(""); //NON-NLS
         filesSetNameTextField.setEnabled(false);
+        this.signaturesListModel.clear();
         enableButtons();
     }
 
@@ -443,6 +444,11 @@ final class FileTypeIdGlobalSettingsPanel extends IngestModuleGlobalSettingsPane
         org.openide.awt.Mnemonics.setLocalizedText(editSigButton, org.openide.util.NbBundle.getMessage(FileTypeIdGlobalSettingsPanel.class, "FileTypeIdGlobalSettingsPanel.editSigButton.text")); // NOI18N
 
         org.openide.awt.Mnemonics.setLocalizedText(deleteSigButton, org.openide.util.NbBundle.getMessage(FileTypeIdGlobalSettingsPanel.class, "FileTypeIdGlobalSettingsPanel.deleteSigButton.text")); // NOI18N
+        deleteSigButton.addActionListener(new java.awt.event.ActionListener() {
+            public void actionPerformed(java.awt.event.ActionEvent evt) {
+                deleteSigButtonActionPerformed(evt);
+            }
+        });
 
         javax.swing.GroupLayout layout = new javax.swing.GroupLayout(this);
         this.setLayout(layout);
@@ -614,6 +620,13 @@ final class FileTypeIdGlobalSettingsPanel extends IngestModuleGlobalSettingsPane
         }
     }//GEN-LAST:event_addButtonMousePressed
 
+    private void deleteSigButtonActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_deleteSigButtonActionPerformed
+        signaturesListModel.removeElementAt(this.signatureList.getSelectedIndex());
+        if (!this.signaturesListModel.isEmpty()) {
+            signatureList.setSelectedIndex(0);
+        }
+    }//GEN-LAST:event_deleteSigButtonActionPerformed
+
     // Variables declaration - do not modify//GEN-BEGIN:variables
     private javax.swing.JButton addSigButton;
     private javax.swing.JButton deleteSigButton;
diff --git a/Core/src/org/sleuthkit/autopsy/modules/filetypeid/UserDefinedFileTypesManager.java b/Core/src/org/sleuthkit/autopsy/modules/filetypeid/UserDefinedFileTypesManager.java
index de6959ef26..0f5b34ee23 100644
--- a/Core/src/org/sleuthkit/autopsy/modules/filetypeid/UserDefinedFileTypesManager.java
+++ b/Core/src/org/sleuthkit/autopsy/modules/filetypeid/UserDefinedFileTypesManager.java
@@ -321,7 +321,7 @@ final class UserDefinedFileTypesManager {
      *                     types.
      */
     synchronized void setUserDefinedFileTypes(List<FileType> newFileTypes) throws UserDefinedFileTypesException {
-        String filePath = getFileTypeDefinitionsFilePath(USER_DEFINED_TYPES_XML_FILE);
+        String filePath = getFileTypeDefinitionsFilePath(USER_DEFINED_TYPES_SERIALIZATION_FILE);
         writeFileTypes(newFileTypes, filePath);
     }