diff --git a/src/main/java/edu/kit/typicalc/view/main/TypeAssumptionField.java b/src/main/java/edu/kit/typicalc/view/main/TypeAssumptionField.java
index 6e999d7..5ad3382 100644
--- a/src/main/java/edu/kit/typicalc/view/main/TypeAssumptionField.java
+++ b/src/main/java/edu/kit/typicalc/view/main/TypeAssumptionField.java
@@ -58,6 +58,7 @@ public class TypeAssumptionField extends HorizontalLayout implements LocaleChang
         minusIcon.setId(MINUS_ICON_ID);
         Button deleteButton = new Button(minusIcon, event -> deleteSelf.accept(this));
         deleteButton.setId(ASS_DELETE_BUTTON_ID);
+        deleteButton.setTabIndex(-1);
         add(variableInputField, typeInputField, deleteButton);
         setId(ASSUMPTIONS_FIELD_ID);
     }