diff --git a/app/models.py b/app/models.py
index 5b86fa28..470e5c6a 100644
--- a/app/models.py
+++ b/app/models.py
@@ -422,6 +422,7 @@ class CorpusFile(db.Model):
         except:
             logger.warning('[ERROR] CorpusFile.delete')
             return
+        self.corpus.status = 'unprepared'
         db.session.delete(self)
         db.session.commit()
 
@@ -435,6 +436,8 @@ class CorpusFile(db.Model):
         text_node.set('publishing_year', str(self.publishing_year))
         text_node.set('title', self.title)
         element_tree.write(file)
+        self.corpus.status = 'unprepared'
+        db.session.commit()
 
 
 class Corpus(db.Model):
diff --git a/app/templates/corpora/corpus.html.j2 b/app/templates/corpora/corpus.html.j2
index 9f934ee3..a686aac2 100644
--- a/app/templates/corpora/corpus.html.j2
+++ b/app/templates/corpora/corpus.html.j2
@@ -61,6 +61,12 @@
       statusElement.classList.remove(...Object.values(CorpusList.STATUS_COLORS));
       statusElement.classList.add(CorpusList.STATUS_COLORS[status] || CorpusList.STATUS_COLORS['default']);
       statusElement.innerText = status;
+      if (status === 'prepared') {
+        var analyseBtn = document.getElementById('analyse');
+        analyseBtn.classList.remove('hide');
+        var prepareBtn = document.getElementById('prepare');
+        prepareBtn.classList.add('hide')
+      }
     }
   }
 
@@ -87,11 +93,9 @@
       </div>
     </div>
     <div class="card-action right-align">
-      {% if corpus.status == 'prepared' %}
-      <a href="{{ url_for('corpora.corpus_analysis', corpus_id=corpus.id) }}" class="waves-effect waves-light btn"><i class="material-icons left">help</i>Analyse</a>
-      {% endif %}
+      <a href="{{ url_for('corpora.corpus_analysis', corpus_id=corpus.id) }}" class="waves-effect waves-light btn hide" id="analyse"><i class="material-icons left">help</i>Analyse</a>
       {% if corpus.files[0] is defined %}
-      <a href="{{ url_for('corpora.prepare_corpus', corpus_id=corpus.id) }}" class="waves-effect waves-light btn"><i class="material-icons left">whatshot</i>Prepare</a>
+      <a href="{{ url_for('corpora.prepare_corpus', corpus_id=corpus.id) }}" class="waves-effect waves-light btn" id="prepare"><i class="material-icons left">whatshot</i>Prepare</a>
       {% endif %}
       <a data-target="delete-corpus-modal" class="waves-effect waves-light btn red modal-trigger"><i class="material-icons left">delete</i>Delete Corpus</a>
     </div>