diff --git a/c_src/fast_tls.c b/c_src/fast_tls.c
index af2cff3..d109db3 100644
--- a/c_src/fast_tls.c
+++ b/c_src/fast_tls.c
@@ -1460,8 +1460,15 @@ static ERL_NIF_TERM set_fips_mode_nif(ErlNifEnv *env, int argc,
 
   if (ret != 1)
     return ssl_error(env, "FIPS_mode_set() failed");
-#elif __GNUC__
-#warning OpenSSL 3 FIPS support not implemented
+#else
+  int fips_mode = EVP_default_properties_is_fips_enabled(NULL);
+
+  if ((fips_mode == 0 && enable != 0) ||
+      (fips_mode != 0 && enable == 0))
+    ret = EVP_default_properties_enable_fips(NULL, enable);
+
+  if (ret != 1)
+    return ssl_error(env, "FIPS_mode_set() failed");
 #endif
 
   return enif_make_atom(env, "ok");
@@ -1473,10 +1480,7 @@ static ERL_NIF_TERM get_fips_mode_nif(ErlNifEnv *env, int argc,
 #if OPENSSL_VERSION_NUMBER < 0x30000000L
   const char *ret = FIPS_mode() ? "true" : "false";
 #else
-#if __GNUC__
-#warning OpenSSL 3 FIPS support not implemented
-#endif
-  static const char *ret = "false";
+  const char *ret = EVP_default_properties_is_fips_enabled(NULL) ? "true" : "false";
 #endif
 
   return enif_make_atom(env, ret);