diff --git a/src/AstGen.zig b/src/AstGen.zig
index 296eb80e7c..b66f7b868b 100644
--- a/src/AstGen.zig
+++ b/src/AstGen.zig
@@ -6842,7 +6842,7 @@ fn asmExpr(
         const name = try astgen.identAsString(symbolic_name);
         const constraint_token = symbolic_name + 2;
         const constraint = (try astgen.strLitAsString(constraint_token)).index;
-        const operand = try expr(gz, scope, .{ .ty = .usize_type }, node_datas[input_node].lhs);
+        const operand = try expr(gz, scope, .none, node_datas[input_node].lhs);
         inputs[i] = .{
             .name = name,
             .constraint = constraint,
diff --git a/src/Sema.zig b/src/Sema.zig
index f13f97bbbb..112939c995 100644
--- a/src/Sema.zig
+++ b/src/Sema.zig
@@ -10304,7 +10304,14 @@ fn zirAsm(
         const name = sema.code.nullTerminatedString(input.data.name);
         _ = name; // TODO: use the name
 
-        arg.* = sema.resolveInst(input.data.operand);
+        const uncasted_arg = sema.resolveInst(input.data.operand);
+        const uncasted_arg_ty = sema.typeOf(uncasted_arg);
+        switch (uncasted_arg_ty.zigTypeTag()) {
+            .ComptimeInt => arg.* = try sema.coerce(block, Type.initTag(.usize), uncasted_arg, src),
+            .ComptimeFloat => arg.* = try sema.coerce(block, Type.initTag(.f64), uncasted_arg, src),
+            else => arg.* = uncasted_arg,
+        }
+
         const constraint = sema.code.nullTerminatedString(input.data.constraint);
         needed_capacity += constraint.len / 4 + 1;
         inputs[arg_i] = constraint;