diff --git a/lib/std/process.zig b/lib/std/process.zig
index 80be705187..f5972eda1e 100644
--- a/lib/std/process.zig
+++ b/lib/std/process.zig
@@ -1131,7 +1131,7 @@ pub fn execve(
     defer arena_allocator.deinit();
     const arena = arena_allocator.allocator();
 
-    const argv_buf = try arena.allocSentinel(?[*:0]u8, argv.len, null);
+    const argv_buf = try arena.allocSentinel(?[*:0]const u8, argv.len, null);
     for (argv, 0..) |arg, i| argv_buf[i] = (try arena.dupeZ(u8, arg)).ptr;
 
     const envp = m: {
@@ -1143,7 +1143,7 @@ pub fn execve(
         } else if (builtin.output_mode == .Exe) {
             // Then we have Zig start code and this works.
             // TODO type-safety for null-termination of `os.environ`.
-            break :m @ptrCast([*:null]?[*:0]u8, os.environ.ptr);
+            break :m @ptrCast([*:null]?[*:0]const u8, os.environ.ptr);
         } else {
             // TODO come up with a solution for this.
             @compileError("missing std lib enhancement: std.process.execv implementation has no way to collect the environment variables to forward to the child process");