diff --git a/bootstrap.sh b/bootstrap.sh
index 064dfb5..844dbe6 100755
--- a/bootstrap.sh
+++ b/bootstrap.sh
@@ -68,7 +68,7 @@ function unpack_clean {
 }
 
 function compare_version {
-  python - "$1" "$2" "$3" <<EOF
+  python2.7 - "$1" "$2" "$3" <<EOF
 from distutils.version import StrictVersion
 import sys