diff --git a/MVMCoreUI/OtherHandlers/MVMCoreUIMoleculeMappingObject.m b/MVMCoreUI/OtherHandlers/MVMCoreUIMoleculeMappingObject.m
index 7bdaf8af..e64f643f 100644
--- a/MVMCoreUI/OtherHandlers/MVMCoreUIMoleculeMappingObject.m
+++ b/MVMCoreUI/OtherHandlers/MVMCoreUIMoleculeMappingObject.m
@@ -41,7 +41,7 @@
                      @"checkbox" : Checkbox.class,
                      @"checkboxWithLabelView" : CheckboxWithLabelView.class,
                      @"cornerLabels" : CornerLabels.class,
-                     @"progressBar": ProgressBar.class,
+                     @"progressbar": ProgressBar.class,
                      @"multiProgressBar": MultiProgress.class,
                      @"checkbox": MVMCoreUICheckBox.class,
                      @"radioButton": RadioButton.class,