diff --git a/docs/build_linux.txt b/docs/build_linux.txt
index 57bb556..69baade 100644
--- a/docs/build_linux.txt
+++ b/docs/build_linux.txt
@@ -7,6 +7,5 @@ $ sudo apt-get install build-essential libtool git libboost-system-dev libboost-
 
 $ git clone https://github.com/GOSTSec/gostcoin.git
 $ cd gostcoin
-$ qmake -qt=5 RELEASE=1 USE_QRCODE=1 USE_IPV6=1 USE_BUILD_INFO=1
-$ export CXXFLAGS=-DBOOST_NO_CXX11_SCOPED_ENUMS
+$ qmake -qt=5 RELEASE=1 USE_QRCODE=1 USE_IPV6=1 USE_BUILD_INFO=1 BOOST_NO_CXX11_SCOPED_ENUMS=1
 $ make -j2