diff --git a/lib/cpp/src/thrift/transport/TSSLSocket.cpp b/lib/cpp/src/thrift/transport/TSSLSocket.cpp
index eb96a73..26ae2be 100644
--- a/lib/cpp/src/thrift/transport/TSSLSocket.cpp
+++ b/lib/cpp/src/thrift/transport/TSSLSocket.cpp
@@ -825,7 +825,7 @@
     throw TSSLException("SSL_get_?bio returned nullptr");
   }
 
-  if (BIO_get_fd(bio, &fdSocket) <= 0) {
+  if (BIO_get_fd(bio, &fdSocket) < 0) {
     throw TSSLException("BIO_get_fd failed");
   }