diff --git a/src/Extracting/Strategies/UrlParameters/GetFromLaravelAPI.php b/src/Extracting/Strategies/UrlParameters/GetFromLaravelAPI.php
index 37563e0d..b11d7a19 100644
--- a/src/Extracting/Strategies/UrlParameters/GetFromLaravelAPI.php
+++ b/src/Extracting/Strategies/UrlParameters/GetFromLaravelAPI.php
@@ -66,7 +66,9 @@ public function __invoke(ExtractedEndpointData $endpointData, array $routeRules)
                         continue;
                     }
 
-                    $type = $this->normalizeTypeName($argumentInstance->getKeyType());
+                    $typeName = $argumentInstance->getKeyName() === $argumentInstance->getRouteKeyName()
+                        ? $argumentInstance->getKeyType() : 'string';
+                    $type = $this->normalizeTypeName($typeName);
                     $parameters[$paramName]['type'] = $type;
 
                     // If the user explicitly set a `where()` constraint, use that to refine examples