diff --git a/ash/src/instance.rs b/ash/src/instance.rs
index 8b3e6ff..51a378f 100644
--- a/ash/src/instance.rs
+++ b/ash/src/instance.rs
@@ -151,10 +151,10 @@ pub trait InstanceV1_1: InstanceV1_0 {
         }
     }
 
-    fn get_physical_device_queue_family_properties2(
+    fn get_physical_device_queue_family_properties2_len(
         &self,
         physical_device: vk::PhysicalDevice,
-    ) -> Vec<vk::QueueFamilyProperties2> {
+    ) -> usize {
         unsafe {
             let mut queue_count = 0;
             self.fp_v1_1().get_physical_device_queue_family_properties2(
@@ -162,17 +162,23 @@ pub trait InstanceV1_1: InstanceV1_0 {
                 &mut queue_count,
                 ptr::null_mut(),
             );
-            let mut queue_families_vec = Vec::with_capacity(queue_count as usize);
-            self.fp_v1_1().get_physical_device_queue_family_properties2(
-                physical_device,
-                &mut queue_count,
-                queue_families_vec.as_mut_ptr(),
-            );
-            queue_families_vec.set_len(queue_count as usize);
-            queue_families_vec
+            queue_count as usize
         }
     }
 
+    unsafe fn get_physical_device_queue_family_properties2(
+        &self,
+        physical_device: vk::PhysicalDevice,
+        queue_family_props: &mut [vk::QueueFamilyProperties2]
+    ) {
+        let mut queue_count = queue_family_props.len() as u32;
+        self.fp_v1_1().get_physical_device_queue_family_properties2(
+            physical_device,
+            &mut queue_count,
+            queue_family_props.as_mut_ptr(),
+        );
+    }
+
     fn get_physical_device_memory_properties2(
         &self,
         physical_device: vk::PhysicalDevice,