diff --git a/src/apps.js b/src/apps.js
index d4d2dacce..bdf1c676a 100644
--- a/src/apps.js
+++ b/src/apps.js
@@ -383,7 +383,7 @@ function getDuplicateErrorDetails(errorMessage, locations, domainObjectMap, port
 
     // check if any of the port bindings conflict
     for (let portName in portBindings) {
-        if (portBindings[portName] === parseInt(match[1])) return new BoxError(BoxError.ALREADY_EXISTS, `Port ${match[1]} is reserved`, { portName });
+        if (portBindings[portName] === parseInt(match[1])) return new BoxError(BoxError.ALREADY_EXISTS, `Port ${match[1]} is in use`, { portName });
     }
 
     if (match[2] === 'dataDir') {