diff --git a/src/main/groovy/com/avast/gradle/dockercompose/tasks/ComposeUp.groovy b/src/main/groovy/com/avast/gradle/dockercompose/tasks/ComposeUp.groovy
index 7c684b0d..54c433b4 100644
--- a/src/main/groovy/com/avast/gradle/dockercompose/tasks/ComposeUp.groovy
+++ b/src/main/groovy/com/avast/gradle/dockercompose/tasks/ComposeUp.groovy
@@ -129,7 +129,7 @@ abstract class ComposeUp extends DefaultTask {
         }
         if (composeExecutor.get().isScaleSupported()) {
             args += scale.get().collect { service, value ->
-                ['--scale', "$service=$value"]
+                ['--scale', "$service=$value".toString()]
             }.flatten()
         }
         args += upAdditionalArgs.get()