diff --git a/dev-libs/boost/boost-1.55.0.recipe b/dev-libs/boost/boost-1.55.0.recipe
index 74d270f35..b1a2daff6 100644
--- a/dev-libs/boost/boost-1.55.0.recipe
+++ b/dev-libs/boost/boost-1.55.0.recipe
@@ -12,8 +12,11 @@ CHECKSUM_MD5="d6eef4b4cacb2183f2bf265a5a03a354"
 REVISION="1"
 LICENSE="Boost v1.0"
 COPYRIGHT="1998-2013 Beman Dawes, David Abrahams, Rene Rivera, et al."
-ARCHITECTURES="?x86_gcc2 ?x86"
-SECONDARY_ARCHITECTURES="x86"
+ARCHITECTURES="x86 ?x86_64"
+if [ $effectiveTargetArchitecture != x86_gcc2 ]; then
+	ARCHITECTURES="$ARCHITECTURES x86_gcc2"
+fi
+SECONDARY_ARCHITECTURES="x86 ?x86_64"
 SOURCE_DIR="boost_1_55_0"	
 PATCHES="
 	boost-1.55.0.patch