diff --git a/scripts/sphinx-pre-install b/scripts/sphinx-pre-install
index 067459760a7b048d4b53c28ac476189ac5884c21..3524dbc313163e70d05a5bda0b0a31d41668502d 100755
--- a/scripts/sphinx-pre-install
+++ b/scripts/sphinx-pre-install
@@ -301,7 +301,7 @@ sub give_redhat_hints()
 	#
 	# Checks valid for RHEL/CentOS version 7.x.
 	#
-	if (! $system_release =~ /Fedora/) {
+	if (!($system_release =~ /Fedora/)) {
 		$map{"virtualenv"} = "python-virtualenv";
 	}