diff --git a/src/decoder_allocators.hpp b/src/decoder_allocators.hpp
index f6b967be..2620f1b8 100644
--- a/src/decoder_allocators.hpp
+++ b/src/decoder_allocators.hpp
@@ -58,7 +58,8 @@ class c_single_allocator
 
     std::size_t size () const { return _buf_size; }
 
-    void resize (std::size_t new_size_) { _buf_size = new_size_; }
+    //  This buffer is fixed, size must not be changed
+    void resize (std::size_t new_size_) { LIBZMQ_UNUSED (new_size_); }
 
   private:
     std::size_t _buf_size;
diff --git a/tests/testutil.cpp b/tests/testutil.cpp
index 4c7e9e89..971159a3 100644
--- a/tests/testutil.cpp
+++ b/tests/testutil.cpp
@@ -233,10 +233,12 @@ void setup_test_environment (int timeout_seconds_)
     // abort test after 121 seconds
     alarm (121);
 #else
+#if !defined ZMQ_DISABLE_TEST_TIMEOUT
     // abort test after timeout_seconds_ seconds
     alarm (timeout_seconds_);
 #endif
 #endif
+#endif
 #if defined __MVS__
     // z/OS UNIX System Services: Ignore SIGPIPE during test runs, as a
     // workaround for no SO_NOGSIGPIPE socket option.