diff --git a/src/Packet.zig b/src/Packet.zig
index d63a79e..4cd64a9 100644
--- a/src/Packet.zig
+++ b/src/Packet.zig
@@ -65,7 +65,7 @@ pub fn parse(self: *Self, allocator: Allocator, emu: Emulator) !String {
             const ret = try allocator.alloc(u8, r.len * reg_len + reg_len); // r0 -> r15 + CPSR
 
             {
-                var i: usize = 0;
+                var i: u32 = 0;
                 while (i < r.len + 1) : (i += 1) {
                     const reg: u32 = if (i < r.len) r[i] else cpsr;
 
@@ -93,7 +93,7 @@ pub fn parse(self: *Self, allocator: Allocator, emu: Emulator) !String {
             const ret = try allocator.alloc(u8, len * 2);
 
             {
-                var i: usize = 0;
+                var i: u32 = 0;
                 while (i < len) : (i += 1) {
                     const value: u8 = emu.read(addr + i);