diff --git a/libc/src/__support/OSUtil/gpu/io.cpp b/libc/src/__support/OSUtil/gpu/io.cpp
--- a/libc/src/__support/OSUtil/gpu/io.cpp
+++ b/libc/src/__support/OSUtil/gpu/io.cpp
@@ -16,7 +16,7 @@
 
 void write_to_stderr(cpp::string_view msg) {
   rpc::Port port = rpc::client.open(rpc::PRINT_TO_STDERR);
-  port.send_n(msg.data(), msg.size() + 1);
+  port.send_n(msg.data(), msg.size());
   port.close();
 }
 
diff --git a/libc/utils/gpu/loader/Server.h b/libc/utils/gpu/loader/Server.h
--- a/libc/utils/gpu/loader/Server.h
+++ b/libc/utils/gpu/loader/Server.h
@@ -30,9 +30,14 @@
 
   switch (port->get_opcode()) {
   case __llvm_libc::rpc::Opcode::PRINT_TO_STDERR: {
+    uint64_t str_size;
     void *str = nullptr;
-    port->recv_n([&](uint64_t size) { return str = malloc(size); });
-    fputs(reinterpret_cast<char *>(str), stderr);
+    port->recv_n([&](uint64_t size) {
+      str_size = size;
+      str = malloc(size);
+      return str;
+    });
+    fwrite(str, str_size, 1, stderr);
     free(str);
     break;
   }