diff --git a/adminer/static/functions.js b/adminer/static/functions.js
index d443916d..ee717fa8 100644
--- a/adminer/static/functions.js
+++ b/adminer/static/functions.js
@@ -376,7 +376,7 @@ function selectDblClick(td, event, text) {
 * @return bool
 */
 function bodyClick(event, db, ns) {
-	if (event.getPreventDefault ? event.getPreventDefault() : !event.returnValue) {
+	if (event.getPreventDefault ? event.getPreventDefault() : event.returnValue === false) {
 		return false;
 	}
 	var el = event.target || event.srcElement;