diff --git a/cdist/conf/explorer/os_version b/cdist/conf/explorer/os_version
index e70fe7f4..8083061b 100755
--- a/cdist/conf/explorer/os_version
+++ b/cdist/conf/explorer/os_version
@@ -95,7 +95,8 @@ in
       cat /etc/gentoo-release
    ;;
    macosx)
-      sw_vers -productVersion
+      # NOTE: Legacy versions (< 10.3) do not support options
+      sw_vers | awk -F ':[ \t]+' '$1 == "ProductVersion" { print $2 }'
    ;;
    freebsd)
       # Apparently uname -r is not a reliable way to get the patch level.