diff --git a/lib/std/os/uefi/protocols/device_path_protocol.zig b/lib/std/os/uefi/protocols/device_path_protocol.zig
index a083959521..5f15004c24 100644
--- a/lib/std/os/uefi/protocols/device_path_protocol.zig
+++ b/lib/std/os/uefi/protocols/device_path_protocol.zig
@@ -48,7 +48,7 @@ pub const DevicePathProtocol = extern struct {
         // DevicePathProtocol for the extra node before the end
         var buf = try allocator.alloc(u8, path_size + 2 * (path.len + 1) + @sizeOf(DevicePathProtocol));
 
-        @memcpy(buf[0..path_size.len], @as([*]const u8, @ptrCast(self))[0..path_size]);
+        @memcpy(buf[0..path_size], @as([*]const u8, @ptrCast(self))[0..path_size]);
 
         // Pointer to the copy of the end node of the current chain, which is - 4 from the buffer
         // as the end node itself is 4 bytes (type: u8 + subtype: u8 + length: u16).
diff --git a/lib/std/os/uefi/protocols/hii.zig b/lib/std/os/uefi/protocols/hii.zig
index c7199d2950..d1db5028a6 100644
--- a/lib/std/os/uefi/protocols/hii.zig
+++ b/lib/std/os/uefi/protocols/hii.zig
@@ -39,7 +39,7 @@ pub const HIISimplifiedFontPackage = extern struct {
     number_of_wide_glyphs: u16,
 
     pub fn getNarrowGlyphs(self: *HIISimplifiedFontPackage) []NarrowGlyph {
-        return @as([*]NarrowGlyph, @ptrCast(@as([*]u8, @ptrCast(self)) + @sizeOf(HIISimplifiedFontPackage)))[0..self.number_of_narrow_glyphs];
+        return @as([*]NarrowGlyph, @ptrCast(@alignCast(@as([*]u8, @ptrCast(self)) + @sizeOf(HIISimplifiedFontPackage))))[0..self.number_of_narrow_glyphs];
     }
 };
 
diff --git a/lib/std/os/uefi/protocols/managed_network_protocol.zig b/lib/std/os/uefi/protocols/managed_network_protocol.zig
index 3dca6f5103..c71c408d04 100644
--- a/lib/std/os/uefi/protocols/managed_network_protocol.zig
+++ b/lib/std/os/uefi/protocols/managed_network_protocol.zig
@@ -119,7 +119,7 @@ pub const ManagedNetworkTransmitData = extern struct {
     fragment_count: u16,
 
     pub fn getFragments(self: *ManagedNetworkTransmitData) []ManagedNetworkFragmentData {
-        return @as([*]ManagedNetworkFragmentData, @ptrCast(@as([*]u8, @ptrCast(self)) + @sizeOf(ManagedNetworkTransmitData)))[0..self.fragment_count];
+        return @as([*]ManagedNetworkFragmentData, @ptrCast(@alignCast(@as([*]u8, @ptrCast(self)) + @sizeOf(ManagedNetworkTransmitData))))[0..self.fragment_count];
     }
 };
 
diff --git a/lib/std/os/uefi/protocols/udp6_protocol.zig b/lib/std/os/uefi/protocols/udp6_protocol.zig
index a629836fd7..91ee603ae9 100644
--- a/lib/std/os/uefi/protocols/udp6_protocol.zig
+++ b/lib/std/os/uefi/protocols/udp6_protocol.zig
@@ -88,7 +88,7 @@ pub const Udp6ReceiveData = extern struct {
     fragment_count: u32,
 
     pub fn getFragments(self: *Udp6ReceiveData) []Udp6FragmentData {
-        return @as([*]Udp6FragmentData, @ptrCast(@as([*]u8, @ptrCast(self)) + @sizeOf(Udp6ReceiveData)))[0..self.fragment_count];
+        return @as([*]Udp6FragmentData, @ptrCast(@alignCast(@as([*]u8, @ptrCast(self)) + @sizeOf(Udp6ReceiveData))))[0..self.fragment_count];
     }
 };
 
@@ -98,7 +98,7 @@ pub const Udp6TransmitData = extern struct {
     fragment_count: u32,
 
     pub fn getFragments(self: *Udp6TransmitData) []Udp6FragmentData {
-        return @as([*]Udp6FragmentData, @ptrCast(@as([*]u8, @ptrCast(self)) + @sizeOf(Udp6TransmitData)))[0..self.fragment_count];
+        return @as([*]Udp6FragmentData, @ptrCast(@alignCast(@as([*]u8, @ptrCast(self)) + @sizeOf(Udp6TransmitData))))[0..self.fragment_count];
     }
 };