diff --git a/lib/upgradelib.php b/lib/upgradelib.php
index 5528879f511..acd4adcc42e 100644
--- a/lib/upgradelib.php
+++ b/lib/upgradelib.php
@@ -631,7 +631,7 @@ function upgrade_plugins($type, $startcallback, $endcallback, $verbose) {
 
         // Throw exception if plugin is incompatible with moodle version.
         if (!empty($plugin->incompatible)) {
-            if ($CFG->branch <= $plugin->incompatible) {
+            if ($CFG->branch >= $plugin->incompatible) {
                 throw new plugin_incompatible_exception($component, $plugin->version);
             }
         }