diff --git a/include/openssl/ec_key.h b/include/openssl/ec_key.h
index 78b2f25..5b0f516 100644
--- a/include/openssl/ec_key.h
+++ b/include/openssl/ec_key.h
@@ -323,7 +323,7 @@
 #if defined(__cplusplus)
 }  /* extern C */
 
-#if __cplusplus >= 201103
+#if defined(BORINGSSL_HAVE_CXX11)
 
 namespace bssl {