diff --git a/examples/fontviewer.zig b/examples/fontviewer.zig
index f579a65..cb8d815 100644
--- a/examples/fontviewer.zig
+++ b/examples/fontviewer.zig
@@ -96,10 +96,11 @@ pub fn main() !u8 {
         const list, _ = try source.readSynchronousReplyHeader(sink.sequence, .ListFonts);
         std.log.info("font count {}", .{list.count});
         const remaining_size = source.replyRemainingSize();
-        const font_mem = try allocator.alloc(u8, remaining_size);
+        const font_mem = try allocator.alloc(u8, @intCast(remaining_size));
         try source.readReply(font_mem);
         const fonts = try allocator.alloc(x11.Slice(u8, [*]const u8), list.count);
-        var font_mem_index: u34 = 0;
+        var font_mem_index: usize = 0;
+
         for (fonts.ptr[0..list.count]) |*font| {
             if (font_mem_index == font_mem.len) @panic("fonts truncated");
             const len = font_mem[font_mem_index];
@@ -321,7 +322,7 @@ const State = struct {
                         "msg size is {} but fields require {}",
                         .{ msg_remaining_size, required_remaining_size },
                     );
-                    try source.replyDiscard(msg_remaining_size);
+                    try source.replyDiscard(@intCast(msg_remaining_size));
                     const font_info: FontInfo = .{
                         .font_ascent = font.font_ascent,
                         .font_descent = font.font_descent,
diff --git a/examples/getserverfontnames.zig b/examples/getserverfontnames.zig
index 706e428..5232f76 100644
--- a/examples/getserverfontnames.zig
+++ b/examples/getserverfontnames.zig
@@ -48,7 +48,7 @@ pub fn main() !void {
     }
     const remaining = source.replyRemainingSize();
     std.log.info("discarding remaining {} bytes...", .{remaining});
-    try source.replyDiscard(remaining);
+    try source.replyDiscard(@intCast(remaining));
 
     try stdout.flush();
 }
diff --git a/examples/testexample.zig b/examples/testexample.zig
index 619692f..28b3d69 100644
--- a/examples/testexample.zig
+++ b/examples/testexample.zig
@@ -335,7 +335,7 @@ pub fn main() !u8 {
             }
         }
         // NOTE: there is stil two more lists we could read
-        try source.replyDiscard(source.replyRemainingSize());
+        try source.replyDiscard(@intCast(source.replyRemainingSize()));
 
         if (maybe_picture_format) |format| {
             std.log.info("using format {f}", .{format});
@@ -810,7 +810,7 @@ fn checkTestImageIsDrawnToWindow(
 
     const log_image = false;
 
-    for (0..image_size / 4) |_| {
+    for (0..@intCast(image_size / 4)) |_| {
         if (width_index >= test_image.width) {
             // For Debugging: Print a newline after each row
             if (log_image) std.debug.print("\n", .{});
diff --git a/src/x.zig b/src/x.zig
index c083686..8bf4d06 100644
--- a/src/x.zig
+++ b/src/x.zig
@@ -4323,7 +4323,7 @@ pub const Source = struct {
             .reply => |*reply_state| {
                 const remaining = reply_state.remaining();
                 std.debug.assert(remaining > 0);
-                try source.reader.discardAll(remaining);
+                try source.reader.discardAll(@intCast(remaining));
                 source.state = .kind;
             },
             .err => return,
@@ -4535,7 +4535,7 @@ pub const Source = struct {
         };
         const total = reply_state.total();
         std.debug.assert(reply_state.taken + n <= total);
-        const data = try source.reader.take(n);
+        const data = try source.reader.take(@intCast(n));
         reply_state.taken += @intCast(data.len);
         if (reply_state.taken == total) {
             source.state = .kind;
diff --git a/src/x/draft.zig b/src/x/draft.zig
index 1cfa821..be250ad 100644
--- a/src/x/draft.zig
+++ b/src/x/draft.zig
@@ -151,7 +151,10 @@ pub fn readSetupDynamic(
         }
         const vendor_written = old_remaining - source.replyRemainingSize();
         const vendor_remaining = setup.vendor_len - vendor_written;
-        try source.replyDiscard(vendor_remaining + x11.pad4Len(@truncate(setup.vendor_len)));
+        const vendor_remaining_bytes: usize = @intCast(
+            vendor_remaining + x11.pad4Len(@truncate(setup.vendor_len)),
+        );
+        try source.replyDiscard(vendor_remaining_bytes);
     }
 
     for (0..setup.format_count) |index| {