diff --git a/src/Generator.php b/src/Generator.php
index fbadc1bca..98f7d83f7 100644
--- a/src/Generator.php
+++ b/src/Generator.php
@@ -188,7 +188,12 @@ public function createClassNameDetails(string $name, string $namespacePrefix, st
             $className = Str::asClassName($name, $suffix);
 
             try {
-                Validator::classDoesNotExist($className);
+                $check = $className;
+                if (!empty($namespacePrefix) && empty($suffix)) {
+                    $check = \sprintf('%s\%s', $namespacePrefix, $check);
+                }
+                Validator::classDoesNotExist($check);
+
                 $className = rtrim($fullNamespacePrefix, '\\').'\\'.$className;
             } catch (RuntimeCommandException) {
             }