diff --git a/selfhost/cmd/w6c/main.combined.ww b/selfhost/cmd/w6c/main.combined.ww
index 0597edff..e7dd5c31 100644
--- a/selfhost/cmd/w6c/main.combined.ww
+++ b/selfhost/cmd/w6c/main.combined.ww
@@ -7895,7 +7895,7 @@ fn astoffset(c: *checker, dot: *node) i64 = {
 // just for the AST printer, but set it for parity with the parser's
 // own literal-emit shape.
 fn arenau64tos(a: *arena, v: u64) str = {
-	let buf: *u8 = amalloc(a, 24u64): *u8;
+	let buf: []u8 = alloc([], 24u64)!;
 	let i: i32 = 23;
 	buf[i] = 0u8;
 	if (v == 0u64) { i -= 1; buf[i] = 48u8; };
@@ -7906,7 +7906,7 @@ fn arenau64tos(a: *arena, v: u64) str = {
 		n /= 10u64;
 	};
 	let r: str;
-	r.ptr = buf + (i: u64);
+	r.ptr = buf.ptr + (i: u64);
 	r.len = 23 - i;
 	return r;
 };
diff --git a/selfhost/cmd/wcc/check.ww b/selfhost/cmd/wcc/check.ww
index 7799ffa0..18e7dba1 100644
--- a/selfhost/cmd/wcc/check.ww
+++ b/selfhost/cmd/wcc/check.ww
@@ -839,7 +839,7 @@ fn astoffset(c: *checker, dot: *node) i64 = {
 // just for the AST printer, but set it for parity with the parser's
 // own literal-emit shape.
 fn arenau64tos(a: *arena, v: u64) str = {
-	let buf: *u8 = amalloc(a, 24u64): *u8;
+	let buf: []u8 = alloc([], 24u64)!;
 	let i: i32 = 23;
 	buf[i] = 0u8;
 	if (v == 0u64) { i -= 1; buf[i] = 48u8; };
@@ -850,7 +850,7 @@ fn arenau64tos(a: *arena, v: u64) str = {
 		n /= 10u64;
 	};
 	let r: str;
-	r.ptr = buf + (i: u64);
+	r.ptr = buf.ptr + (i: u64);
 	r.len = 23 - i;
 	return r;
 };
diff --git a/selfhost/cmd/wwdump/main.combined.ww b/selfhost/cmd/wwdump/main.combined.ww
index 24945ed5..63177bc8 100644
--- a/selfhost/cmd/wwdump/main.combined.ww
+++ b/selfhost/cmd/wwdump/main.combined.ww
@@ -7895,7 +7895,7 @@ fn astoffset(c: *checker, dot: *node) i64 = {
 // just for the AST printer, but set it for parity with the parser's
 // own literal-emit shape.
 fn arenau64tos(a: *arena, v: u64) str = {
-	let buf: *u8 = amalloc(a, 24u64): *u8;
+	let buf: []u8 = alloc([], 24u64)!;
 	let i: i32 = 23;
 	buf[i] = 0u8;
 	if (v == 0u64) { i -= 1; buf[i] = 48u8; };
@@ -7906,7 +7906,7 @@ fn arenau64tos(a: *arena, v: u64) str = {
 		n /= 10u64;
 	};
 	let r: str;
-	r.ptr = buf + (i: u64);
+	r.ptr = buf.ptr + (i: u64);
 	r.len = 23 - i;
 	return r;
 };