diff --git a/bin/elasticsearch.bat b/bin/elasticsearch.bat
index f4e074a4729..24b129aa876 100644
--- a/bin/elasticsearch.bat
+++ b/bin/elasticsearch.bat
@@ -48,7 +48,7 @@ REM space for a full heap dump.
 REM JAVA_OPTS=%JAVA_OPTS% -XX:HeapDumpPath=$ES_HOME/logs/heapdump.hprof
 
 
-set ES_CLASSPATH=%CLASSPATH%;%ES_HOME%/lib/*;%ES_HOME%/lib/sigar/*
+set ES_CLASSPATH=%ES_CLASSPATH%;%ES_HOME%/lib/*;%ES_HOME%/lib/sigar/*
 set ES_PARAMS=-Delasticsearch -Des-foreground=yes -Des.path.home="%ES_HOME%"
 
 "%JAVA_HOME%\bin\java" %JAVA_OPTS% %ES_JAVA_OPTS% %ES_PARAMS% -cp "%ES_CLASSPATH%" "org.elasticsearch.bootstrap.ElasticSearch"