diff --git a/lib/compiler_rt/arm.zig b/lib/compiler_rt/arm.zig
index eecb0e5d03..d3a9e4f696 100644
--- a/lib/compiler_rt/arm.zig
+++ b/lib/compiler_rt/arm.zig
@@ -57,9 +57,9 @@ const __udivmodsi4 = @import("int.zig").__udivmodsi4;
 const __divmoddi4 = @import("int.zig").__divmoddi4;
 const __udivmoddi4 = @import("int.zig").__udivmoddi4;
 
-extern fn memset(dest: ?[*]u8, c: i32, n: usize) ?[*]u8;
-extern fn memcpy(noalias dest: ?[*]u8, noalias src: ?[*]const u8, n: usize) ?[*]u8;
-extern fn memmove(dest: ?[*]u8, src: ?[*]const u8, n: usize) ?[*]u8;
+extern fn memset(dest: ?*anyopaque, c: i32, n: usize) ?*anyopaque;
+extern fn memcpy(noalias dest: ?*anyopaque, noalias src: ?*const anyopaque, n: usize) ?*anyopaque;
+extern fn memmove(dest: ?*anyopaque, src: ?*const anyopaque, n: usize) ?*anyopaque;
 
 pub fn __aeabi_memcpy(dest: [*]u8, src: [*]u8, n: usize) callconv(.{ .arm_aapcs = .{} }) void {
     @setRuntimeSafety(false);