diff --git a/vulkan-sys/src/enums/samplecountflags.rs b/vulkan-sys/src/enums/samplecountflags.rs
index b7bae78..cc6c4e3 100644
--- a/vulkan-sys/src/enums/samplecountflags.rs
+++ b/vulkan-sys/src/enums/samplecountflags.rs
@@ -15,7 +15,7 @@ pub enum VkSampleCountFlags {
 impl From<u32> for VkSampleCountFlags {
     fn from(n: u32) -> Self {
         match n {
-            1 => Self::VK_SAMPLE_COUNT_1_BIT,
+            0 | 1 => Self::VK_SAMPLE_COUNT_1_BIT,
             2 => Self::VK_SAMPLE_COUNT_2_BIT,
             4 => Self::VK_SAMPLE_COUNT_4_BIT,
             8 => Self::VK_SAMPLE_COUNT_8_BIT,
diff --git a/vulkan-sys/src/structs/core/prelude.rs b/vulkan-sys/src/structs/core/prelude.rs
index f945043..885d903 100644
--- a/vulkan-sys/src/structs/core/prelude.rs
+++ b/vulkan-sys/src/structs/core/prelude.rs
@@ -29,12 +29,8 @@ pub use super::computepipelinecreateinfo::*;
 pub use super::copydescriptorset::*;
 pub use super::debugreportcallbackcreateinfoext::*;
 pub use super::debugutilmessengercallbackdataext::*;
-pub use super::debugutilmessengercallbackdataext::*;
-pub use super::debugutilslabelext::*;
 pub use super::debugutilslabelext::*;
 pub use super::debugutilsmessengercreateinfoext::*;
-pub use super::debugutilsmessengercreateinfoext::*;
-pub use super::debugutilsobjectnameinfoext::*;
 pub use super::debugutilsobjectnameinfoext::*;
 pub use super::descriptorbufferinfo::*;
 pub use super::descriptorimageinfo::*;
@@ -73,7 +69,6 @@ pub use super::imagesubresourcelayers::*;
 pub use super::imagesubresourcerange::*;
 pub use super::imageviewcreateinfo::*;
 pub use super::instancecreateinfo::*;
-pub use super::instancecreateinfo::*;
 pub use super::iossurfacecreateinfomvk::*;
 pub use super::layerproperties::*;
 pub use super::macossurfacecreateinfomvk::*;
@@ -89,7 +84,6 @@ pub use super::mvkswapchainperformance::*;
 pub use super::offset2d::*;
 pub use super::offset3d::*;
 pub use super::physicaldevicefeatures::*;
-pub use super::physicaldevicefeatures::*;
 pub use super::physicaldevicelimits::*;
 pub use super::physicaldevicemaintanence3properties::*;
 pub use super::physicaldevicememoryproperties::*;