diff --git a/CMakeLists.txt b/CMakeLists.txt
index 239a2c9e72..13a6e5d742 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -942,6 +942,7 @@ macro(curl_openssl_check_symbol_exists _symbol _files _variable)
   cmake_push_check_state()
   if(USE_OPENSSL)
     list(APPEND CMAKE_REQUIRED_LIBRARIES OpenSSL::SSL OpenSSL::Crypto)
+    list(APPEND CMAKE_REQUIRED_DEFINITIONS "-DOPENSSL_SUPPRESS_DEPRECATED")  # for SSL_CTX_set_srp_username deprecated since 3.0.0
     if(HAVE_LIBZ)
       list(APPEND CMAKE_REQUIRED_LIBRARIES ZLIB::ZLIB)
     endif()