diff --git a/build.sh b/build.sh
index 3f47be49..9846dc6e 100755
--- a/build.sh
+++ b/build.sh
@@ -52,7 +52,7 @@ while [ "$1" != "" ]; do
             __runTests=true
             __installPythonPackages=true
             ;;
-        --installPythonPackages)
+        --installpythonpackages)
             __installPythonPackages=true
             ;;
         --includeextendedtests)