diff --git a/releng.wtpbuilder/build.properties b/releng.wtpbuilder/build.properties
index 5b027b4..1e4f993 100644
--- a/releng.wtpbuilder/build.properties
+++ b/releng.wtpbuilder/build.properties
@@ -130,7 +130,7 @@
 # being used (JDT Compiler, in our case).
 # 'showversion' causes the version of JDT Compiler to be 
 # printed to the compiler log file. 
-compilerArg=-showversion
+compilerArg=-showversion -warn:-discouraged,serial,unusedImport
 
 
 #############################################################