diff --git a/src/days/day01.zig b/src/days/day01.zig
index afc14bf..df9fec0 100644
--- a/src/days/day01.zig
+++ b/src/days/day01.zig
@@ -14,7 +14,11 @@ pub fn run(_: std.mem.Allocator) !void {
     while (lines.next()) |line| {
         const direction: Direction = if (line[0] == 'L') .left else if (line[0] == 'R') .right else continue;
         const amount = try std.fmt.parseUnsigned(u32, line[1..], 10);
-        try updatePosition(&position, direction, amount, 99);
+
+        zero_hits += try updatePosition(&position, direction, amount, 100);
+
+        std.debug.print("{s} => {d}\n", .{line, position});
+
         if (position == 0) {
             zero_hits += 1;
         }
@@ -39,7 +43,7 @@ fn updatePosition(
     direction: Direction,
     amount: u32,
     upper_bound: u32,
-) !void {
+) !u32 {
     var signed_position: i32 = @intCast(position.*);
 
     switch (direction) {
@@ -51,17 +55,14 @@ fn updatePosition(
         },
     }
 
-    if (signed_position == upper_bound) {
-        position.* = @intCast(signed_position);
-    } else if (signed_position == 0) {
-        position.* = 0;
-    } else if (signed_position > upper_bound or signed_position < 0) {
+    if (signed_position > upper_bound - 1 or signed_position < 0) {
         const signed_upper_bound: i32 = @intCast(upper_bound);
-        var mod = @mod(signed_position, signed_upper_bound);
-        if (signed_position < 0) mod += 1;
+        const mod = @mod(signed_position, signed_upper_bound);
         position.* = @intCast(mod);
+        return 0;
     } else {
         position.* = @intCast(signed_position);
+        return 0;
     }
 }