diff --git a/tools/junit/src/main/java/org/teavm/junit/TeaVMTestConfiguration.java b/tools/junit/src/main/java/org/teavm/junit/TeaVMTestConfiguration.java
index f568ca8d1..bdb5ad0f4 100644
--- a/tools/junit/src/main/java/org/teavm/junit/TeaVMTestConfiguration.java
+++ b/tools/junit/src/main/java/org/teavm/junit/TeaVMTestConfiguration.java
@@ -37,7 +37,7 @@ interface TeaVMTestConfiguration<T extends TeaVMTarget> {
 
         @Override
         public void apply(TeaVM vm) {
-            vm.setOptimizationLevel(TeaVMOptimizationLevel.ADVANCED);
+            vm.setOptimizationLevel(TeaVMOptimizationLevel.SIMPLE);
         }
 
         @Override