diff --git a/src/PocketMine.php b/src/PocketMine.php
index f49115826..4b0b644ec 100644
--- a/src/PocketMine.php
+++ b/src/PocketMine.php
@@ -122,7 +122,7 @@ namespace pocketmine {
 			if(substr_count($pthreads_version, ".") < 2){
 				$pthreads_version = "0.$pthreads_version";
 			}
-			if(version_compare($pthreads_version, "4.0.0") < 0 || version_compare($pthreads_version, "5.0.0") > 0){
+			if(version_compare($pthreads_version, "4.0.0") < 0 || version_compare($pthreads_version, "5.0.0") >= 0){
 				$messages[] = "pthreads ^4.0.0 is required, while you have $pthreads_version.";
 			}
 		}