diff --git a/vulkano/src/instance.rs b/vulkano/src/instance.rs
index 368cc15c..06b09140 100644
--- a/vulkano/src/instance.rs
+++ b/vulkano/src/instance.rs
@@ -170,7 +170,7 @@ impl Instance {
 
         // Enumerating all physical devices.
         let physical_devices: Vec<vk::PhysicalDevice> = unsafe {
-            let mut num = mem::uninitialized();
+            let mut num = 0;
             try!(check_errors(vk.EnumeratePhysicalDevices(instance, &mut num, ptr::null_mut())));
 
             let mut devices = Vec::with_capacity(num as usize);
@@ -192,7 +192,7 @@ impl Instance {
                 };
 
                 let queue_families = unsafe {
-                    let mut num = mem::uninitialized();
+                    let mut num = 0;
                     vk.GetPhysicalDeviceQueueFamilyProperties(device, &mut num, ptr::null_mut());
 
                     let mut families = Vec::with_capacity(num as usize);
@@ -343,7 +343,7 @@ impl From<Error> for InstanceCreationError {
 /// Queries the list of layers that are available when creating an instance.
 pub fn layers_list() -> Result<Vec<LayerProperties>, OomError> {
     unsafe {
-        let mut num = mem::uninitialized();
+        let mut num = 0;
         try!(check_errors(VK_ENTRY.EnumerateInstanceLayerProperties(&mut num, ptr::null_mut())));
 
         let mut layers: Vec<vk::LayerProperties> = Vec::with_capacity(num as usize);
diff --git a/vulkano/src/swapchain/mod.rs b/vulkano/src/swapchain/mod.rs
index 97ecb679..02e2a7c7 100644
--- a/vulkano/src/swapchain/mod.rs
+++ b/vulkano/src/swapchain/mod.rs
@@ -72,7 +72,7 @@ impl DisplayPlane {
         let vk = device.instance().pointers();
 
         let num = unsafe {
-            let mut num: u32 = mem::uninitialized();
+            let mut num: u32 = 0;
             try!(check_errors(vk.GetPhysicalDeviceDisplayPlanePropertiesKHR(device.internal_object(),
                                                                             &mut num, ptr::null_mut())));
             num
@@ -90,7 +90,7 @@ impl DisplayPlane {
 
         Ok(planes.into_iter().enumerate().map(|(index, prop)| {
             let num = unsafe {
-                let mut num: u32 = mem::uninitialized();
+                let mut num: u32 = 0;
                 check_errors(vk.GetDisplayPlaneSupportedDisplaysKHR(device.internal_object(), index as u32,
                                                                     &mut num, ptr::null_mut())).unwrap();       // TODO: shouldn't unwrap
                 num
@@ -140,7 +140,7 @@ impl Display {
         let vk = device.instance().pointers();
 
         let num = unsafe {
-            let mut num = mem::uninitialized();
+            let mut num = 0;
             try!(check_errors(vk.GetPhysicalDeviceDisplayPropertiesKHR(device.internal_object(),
                                                                        &mut num, ptr::null_mut())));
             num
@@ -185,7 +185,7 @@ impl Display {
         let vk = self.device.instance().pointers();
 
         let num = unsafe {
-            let mut num = mem::uninitialized();
+            let mut num = 0;
             try!(check_errors(vk.GetDisplayModePropertiesKHR(self.device.internal_object(),
                                                              self.properties.display, 
                                                              &mut num, ptr::null_mut())));
diff --git a/vulkano/src/swapchain/swapchain.rs b/vulkano/src/swapchain/swapchain.rs
index 05be232c..29e0fe36 100644
--- a/vulkano/src/swapchain/swapchain.rs
+++ b/vulkano/src/swapchain/swapchain.rs
@@ -133,7 +133,7 @@ impl Swapchain {
         });
 
         let images = unsafe {
-            let mut num = mem::uninitialized();
+            let mut num = 0;
             try!(check_errors(vk.GetSwapchainImagesKHR(device.internal_object(),
                                                        swapchain.swapchain, &mut num,
                                                        ptr::null_mut())));