diff --git a/samples/mandel/mandel.bat b/samples/mandel/mandel.bat
index cc0a662ecb295372facef7a3c49d2d5ff72ad9fb..a7175eeb5fa728f6f56862d51464457245cd4ded 100644
--- a/samples/mandel/mandel.bat
+++ b/samples/mandel/mandel.bat
@@ -1,6 +1,8 @@
 java ^
  -Djava.library.path=../../com.amd.aparapi.jni/dist ^
  -Dcom.amd.aparapi.executionMode=%1 ^
+ -Dcom.amd.aparapi.logLevel=ERROR ^
+ -Dcom.amd.aparapi.enableVerboseJNI=true ^
  -Dcom.amd.aparapi.enableProfiling=false ^
  -Dcom.amd.aparapi.enableShowGeneratedOpenCL=true ^
  -classpath ../../com.amd.aparapi/dist/aparapi.jar;mandel.jar ^