diff --git a/sandboxed_api/call.h b/sandboxed_api/call.h
index 8859f9b..06def7e 100644
--- a/sandboxed_api/call.h
+++ b/sandboxed_api/call.h
@@ -78,14 +78,14 @@ struct FuncCall {
 
 struct FuncRet {
   // Return type:
-  v::Type ret_type = v::Type::kVoid;
+  v::Type ret_type;
   // Return value.
   union {
-    uintptr_t int_val = 0;
+    uintptr_t int_val;
     long double float_val;
   };
   // Status of the operation: success/failure.
-  bool success = false;
+  bool success;
 };
 
 }  // namespace sapi
diff --git a/sandboxed_api/client.cc b/sandboxed_api/client.cc
index 48f22ce..ab8c5ec 100644
--- a/sandboxed_api/client.cc
+++ b/sandboxed_api/client.cc
@@ -340,11 +340,7 @@ void ServeRequest(sandbox2::Comms* comms) {
 
   CHECK(comms->RecvTLV(&tag, &bytes));
 
-  FuncRet ret = {
-      .ret_type = v::Type::kVoid,
-      .int_val = static_cast<uintptr_t>(Error::kUnset),
-      .success = false,
-  };
+  FuncRet ret{};  // Brace-init zeroes struct padding
 
   switch (tag) {
     case comms::kMsgCall: