diff --git a/src/PersonObjects/Sleeve/ui/CovenantSleeveMemoryUpgrade.tsx b/src/PersonObjects/Sleeve/ui/CovenantSleeveMemoryUpgrade.tsx
index 0707e4381..ce1d81317 100644
--- a/src/PersonObjects/Sleeve/ui/CovenantSleeveMemoryUpgrade.tsx
+++ b/src/PersonObjects/Sleeve/ui/CovenantSleeveMemoryUpgrade.tsx
@@ -30,6 +30,7 @@ export function CovenantSleeveMemoryUpgrade(props: IProps): React.ReactElement {
     let n: number = parseInt(e.target.value);
 
     if (isNaN(n)) n = 1;
+    if (n < 1) n = 1;
     const maxMemory = 100 - props.sleeve.memory;
     if (n > maxMemory) n = maxMemory;