Guard use of Serialized_RNG with thread macro check

1 files changed, 2 insertions, 0 deletions

diff --git a/src/lib/ffi/ffi_rng.cpp b/src/lib/ffi/ffi_rng.cpp
index b3c5cd967..a4dda59ec 100644
--- a/src/lib/ffi/ffi_rng.cpp
+++ b/src/lib/ffi/ffi_rng.cpp
@@ -32,10 +32,12 @@ int botan_rng_init(botan_rng_t* rng_out, const char* rng_type)
          {
          rng.reset(new Botan::AutoSeeded_RNG);
          }
+#if defined(BOTAN_TARGET_OS_HAS_THREADS)
       else if(rng_type_s == "user-threadsafe")
          {
          rng.reset(new Botan::Serialized_RNG(new Botan::AutoSeeded_RNG));
          }
+#endif
       else
          {
          return BOTAN_FFI_ERROR_BAD_PARAMETER;