diff --git a/src/libtomahawk/Album.cpp b/src/libtomahawk/Album.cpp
index 740abc303..d43462bc2 100644
--- a/src/libtomahawk/Album.cpp
+++ b/src/libtomahawk/Album.cpp
@@ -320,10 +320,13 @@ Album::infoSystemInfo( const Tomahawk::InfoSystem::InfoRequestData& requestData,
             m_coverBuffer = ba;
         }
 
-        m_coverLoaded = true;
-        s_albumsByCoverId.remove( coverId() );
-        m_coverId = uuid();
-        s_albumsByCoverId[ m_coverId ] = m_ownRef.toStrongRef();
+        {
+            QMutexLocker lock( &s_mutex );
+            m_coverLoaded = true;
+            s_albumsByCoverId.remove( coverId() );
+            m_coverId = uuid();
+            s_albumsByCoverId[ m_coverId ] = m_ownRef.toStrongRef();
+        }
         emit coverChanged();
     }
 }
diff --git a/src/libtomahawk/Artist.cpp b/src/libtomahawk/Artist.cpp
index b3c1e14ed..80323f5f5 100644
--- a/src/libtomahawk/Artist.cpp
+++ b/src/libtomahawk/Artist.cpp
@@ -454,10 +454,13 @@ Artist::infoSystemInfo( Tomahawk::InfoSystem::InfoRequestData requestData, QVari
                     m_coverBuffer = ba;
                 }
 
-                m_coverLoaded = true;
-                s_artistsByCoverId.remove( coverId() );
-                m_coverId = uuid();
-                s_artistsByCoverId[ m_coverId ] = m_ownRef.toStrongRef();
+                {
+                    QMutexLocker lock( &s_mutex );
+                    m_coverLoaded = true;
+                    s_artistsByCoverId.remove( coverId() );
+                    m_coverId = uuid();
+                    s_artistsByCoverId[ m_coverId ] = m_ownRef.toStrongRef();
+                }
                 emit coverChanged();
             }