diff --git a/src/main/java/vswe/stevesfactory/components/TextBoxNumberList.java b/src/main/java/vswe/stevesfactory/components/TextBoxNumberList.java
index bab1a7b5a..2868c9973 100644
--- a/src/main/java/vswe/stevesfactory/components/TextBoxNumberList.java
+++ b/src/main/java/vswe/stevesfactory/components/TextBoxNumberList.java
@@ -66,6 +66,7 @@ public boolean onKeyStroke(GuiManager gui, char c, int k) {
             }else if(c == '-' && selectedTextBox.allowNegative()) {
                 selectedTextBox.setNumber(selectedTextBox.getNumber() * -1);
                 selectedTextBox.onNumberChanged();
+                return true;
             }else if(k == 14){
                 selectedTextBox.setNumber(selectedTextBox.getNumber() / 10);
                 selectedTextBox.onNumberChanged();