diff --git a/act b/act
index 4200521ecdb9b2301b3e989c86fcdd295cd31de7..365fe5e99f0b2f974415a6a98724989ef8f45b62 100755
--- a/act
+++ b/act
@@ -43,6 +43,8 @@ CLASSPATH=$CLASSPATH:$ACT_HOME/lib/ibatis/ibatis-2.3.4.726.jar:$ACT_HOME/lib/iba
 # picard jars
 CLASSPATH=$ACT_HOME/lib/picard/sam.jar:$ACT_HOME/lib/picard/picard.jar:$CLASSPATH
 
+CLASSPATH="$ACT_HOME/lib/commons-lang-2.6.jar:$CLASSPATH"
+
 export CLASSPATH
 
 ACT_PROPERTIES="-Dartemis.environment=UNIX"