diff --git a/tools/gradle/src/main/java/org/teavm/gradle/TeaVMPlugin.java b/tools/gradle/src/main/java/org/teavm/gradle/TeaVMPlugin.java
index 726554813..234f59206 100644
--- a/tools/gradle/src/main/java/org/teavm/gradle/TeaVMPlugin.java
+++ b/tools/gradle/src/main/java/org/teavm/gradle/TeaVMPlugin.java
@@ -253,6 +253,7 @@ public class TeaVMPlugin implements Plugin<Project> {
         task.getPreservedClasses().addAll(configuration.getPreservedClasses());
         task.getDebugInformation().convention(configuration.getDebugInformation());
         task.getFastGlobalAnalysis().convention(configuration.getFastGlobalAnalysis());
+        task.getOptimization().convention(configuration.getOptimization());
         task.getOutOfProcess().convention(configuration.getOutOfProcess());
         task.getProcessMemory().convention(configuration.getProcessMemory());
         task.getProperties().putAll(configuration.getProperties());