diff --git a/src/arch/wasm/CodeGen.zig b/src/arch/wasm/CodeGen.zig
index 2072ff15062b85ac291824c04335b1e4ec46a44a..d4be9bf13969a677874143391a0c3c8505d76f9f 100644
--- a/src/arch/wasm/CodeGen.zig
+++ b/src/arch/wasm/CodeGen.zig
@@ -1726,8 +1726,8 @@ fn isByRef(ty: Type, target: std.Target) bool {
 
         .Array,
         .Frame,
-        .Union,
-        => {
+        => return ty.hasRuntimeBitsIgnoreComptime(),
+        .Union => {
             if (ty.castTag(.@"union")) |union_ty| {
                 if (union_ty.data.layout == .Packed) {
                     return ty.abiSize(target) > 8;
diff --git a/src/codegen.zig b/src/codegen.zig
index 692c55e3807d84b366b1eb975094577efd1c769c..adce183833d262c2e1acab40c2a7cb3644ff6fcd 100644
--- a/src/codegen.zig
+++ b/src/codegen.zig
@@ -611,6 +611,10 @@ pub fn generateSymbol(
                 }
             }
 
+            if (layout.padding > 0) {
+                try code.writer().writeByteNTimes(0, layout.padding);
+            }
+
             return Result.ok;
         },
         .Optional => {