diff --git a/src/libprs500/gui2/dialogs/search.py b/src/libprs500/gui2/dialogs/search.py
index eef9e0cacd..3437a3abc4 100644
--- a/src/libprs500/gui2/dialogs/search.py
+++ b/src/libprs500/gui2/dialogs/search.py
@@ -42,6 +42,8 @@ class SearchItem(Ui_Form, QWidget):
     def token(self):
         txt = qstring_to_unicode(self.text.text()).strip()
         if txt:
+            if self.negate.isChecked():
+                txt = '!'+txt
             tok = self.FIELDS[qstring_to_unicode(self.field.currentText())]+txt
             if re.search(r'\s', tok):
                 tok = '"%s"'%tok
diff --git a/src/libprs500/gui2/dialogs/search_item.ui b/src/libprs500/gui2/dialogs/search_item.ui
index cf2d58fe69..035320059f 100644
--- a/src/libprs500/gui2/dialogs/search_item.ui
+++ b/src/libprs500/gui2/dialogs/search_item.ui
@@ -30,6 +30,16 @@
      </property>
     </widget>
    </item>
+   <item>
+    <widget class="QCheckBox" name="negate" >
+     <property name="toolTip" >
+      <string>&lt;p>Negate this match. That is, only return results that &lt;b>do not&lt;/b> match this query.</string>
+     </property>
+     <property name="text" >
+      <string>Negate</string>
+     </property>
+    </widget>
+   </item>
   </layout>
  </widget>
  <resources/>