diff --git a/src/stage1/codegen.cpp b/src/stage1/codegen.cpp
index b9c068d7f7..53b9385e27 100644
--- a/src/stage1/codegen.cpp
+++ b/src/stage1/codegen.cpp
@@ -4411,8 +4411,10 @@ static LLVMValueRef ir_render_call(CodeGen *g, IrExecutableGen *executable, IrIn
             arg_calc = arg_calc_start;
             for (size_t arg_i = 0; arg_i < gen_param_values.length; arg_i += 1) {
                 CalcLLVMFieldIndex prev = arg_calc;
+                // Use the declared argument type and not the value one to be
+                // consistent with the assignment operation below.
                 calc_llvm_field_index_add(g, &arg_calc, gen_param_types.at(arg_i));
-                field_types[arg_calc.field_index - 1] = LLVMTypeOf(gen_param_values.at(arg_i));
+                field_types[arg_calc.field_index - 1] = get_llvm_type(g, gen_param_types.at(arg_i));
                 if (arg_calc.field_index - prev.field_index > 1) {
                     // Padding field
                     uint32_t pad_bytes = arg_calc.offset - prev.offset - gen_param_types.at(arg_i)->abi_size;
diff --git a/test/stage1/behavior/async_fn.zig b/test/stage1/behavior/async_fn.zig
index e2cececf69..d148d84064 100644
--- a/test/stage1/behavior/async_fn.zig
+++ b/test/stage1/behavior/async_fn.zig
@@ -1559,3 +1559,33 @@ test "avoid forcing frame alignment resolution implicit cast to *c_void" {
     resume @ptrCast(anyframe->bool, @alignCast(@alignOf(@Frame(S.foo)), S.x));
     expect(nosuspend await frame);
 }
+
+test "@asyncCall with pass-by-value arguments" {
+    const F0: u64 = 0xbeefbeefbeefbeef;
+    const F1: u64 = 0xf00df00df00df00d;
+    const F2: u64 = 0xcafecafecafecafe;
+
+    const S = struct {
+        pub const ST = struct { f0: usize, f1: usize };
+        pub const AT = [5]u8;
+
+        pub fn f(_fill0: u64, s: ST, _fill1: u64, a: AT, _fill2: u64) callconv(.Async) void {
+            // Check that the array and struct arguments passed by value don't
+            // end up overflowing the adjacent fields in the frame structure.
+            expectEqual(F0, _fill0);
+            expectEqual(F1, _fill1);
+            expectEqual(F2, _fill2);
+        }
+    };
+
+    var buffer: [1024]u8 align(@alignOf(@Frame(S.f))) = undefined;
+    // The function pointer must not be comptime-known.
+    var t = S.f;
+    var frame_ptr = @asyncCall(&buffer, {}, t, .{
+        F0,
+        .{ .f0 = 1, .f1 = 2 },
+        F1,
+        [_]u8{ 1, 2, 3, 4, 5 },
+        F2,
+    });
+}