diff --git a/lib/std/Io/Threaded.zig b/lib/std/Io/Threaded.zig
index 10be5734527fe1e59fbf939031fec35b051644be..0e67fd1a9d3f762adbebf67d1f1937f5ddfa8b73 100644
--- a/lib/std/Io/Threaded.zig
+++ b/lib/std/Io/Threaded.zig
@@ -7194,15 +7194,14 @@ fn processExecutablePath(userdata: ?*anyopaque, out_buffer: []u8) std.process.Ex
             if (std.mem.indexOf(u8, argv0, "/") != null) {
                 // argv[0] is a path (relative or absolute): use realpath(3) directly
                 var real_path_buf: [posix.PATH_MAX]u8 = undefined;
-                const real_path = Io.Dir.realPathFileAbsolute(ioBasic(t), std.os.argv[0], &real_path_buf) catch |err| switch (err) {
+                const real_path_len = Io.Dir.realPathFileAbsolute(ioBasic(t), argv0, &real_path_buf) catch |err| switch (err) {
                     error.NetworkNotFound => unreachable, // Windows-only
                     else => |e| return e,
                 };
-                if (real_path.len > out_buffer.len)
+                if (real_path_len > out_buffer.len)
                     return error.NameTooLong;
-                const result = out_buffer[0..real_path.len];
-                @memcpy(result, real_path);
-                return result.len;
+                @memcpy(out_buffer[0..real_path_len], real_path_buf[0..real_path_len]);
+                return real_path_len;
             } else if (argv0.len != 0) {
                 // argv[0] is not empty (and not a path): search it inside PATH
                 const PATH = posix.getenvZ("PATH") orelse return error.FileNotFound;
@@ -7214,13 +7213,12 @@ fn processExecutablePath(userdata: ?*anyopaque, out_buffer: []u8) std.process.Ex
                     }, 0) catch continue;
 
                     var real_path_buf: [posix.PATH_MAX]u8 = undefined;
-                    if (Io.Dir.realPathFileAbsolute(ioBasic(t), resolved_path, &real_path_buf)) |real_path| {
+                    if (Io.Dir.realPathFileAbsolute(ioBasic(t), resolved_path, &real_path_buf)) |real_path_len| {
                         // found a file, and hope it is the right file
-                        if (real_path.len > out_buffer.len)
+                        if (real_path_len > out_buffer.len)
                             return error.NameTooLong;
-                        const result = out_buffer[0..real_path.len];
-                        @memcpy(result, real_path);
-                        return result.len;
+                        @memcpy(out_buffer[0..real_path_len], real_path_buf[0..real_path_len]);
+                        return real_path_len;
                     } else |_| continue;
                 }
             }