diff --git a/src/app/shipyard/Module.js b/src/app/shipyard/Module.js
index 91322333..06cb9ac6 100755
--- a/src/app/shipyard/Module.js
+++ b/src/app/shipyard/Module.js
@@ -160,7 +160,7 @@ export default class Module {
             result = result + modValue;
           } else if (modification.method === 'overwrite') {
             result = modValue;
-          } else if (name === 'shieldboost') {
+          } else if (name === 'shieldboost' || name === 'hullboost') {
             result = (1 + result) * (1 + modValue) - 1;
           } else {
             result = result * (1 + modValue);