diff --git a/libi2pd/Config.cpp b/libi2pd/Config.cpp
index c313b16d..5551b010 100644
--- a/libi2pd/Config.cpp
+++ b/libi2pd/Config.cpp
@@ -193,7 +193,7 @@ namespace config {
 		options_description precomputation("Precomputation options");
 		precomputation.add_options()
 			("precomputation.elgamal",
-#if (_M_AMD64 || __x86_64__)
+#if (defined(_M_AMD64) || defined(__x86_64__))
 				value<bool>()->default_value(false),
 #else
 				value<bool>()->default_value(true),