diff --git a/install/install-helics-source.sh b/install/install-helics-source.sh
index d1f613c..1718d23 100755
--- a/install/install-helics-source.sh
+++ b/install/install-helics-source.sh
@@ -41,7 +41,7 @@ export BOOST_ROOT
 echo "Building HELICS"
 mkdir build
 cd build || exit
-cmake ${CMAKE_GEN} -DCMAKE_INSTALL_PREFIX="${INSTALL_PREFIX}" -DCMAKE_BUILD_TYPE=Release -DHELICS_BUILD_CXX_SHARED_LIB=ON -DHELICS_BUILD_EXAMPLES=OFF -DBUILD_TESTING=OFF -DHELICS_ZMQ_SUBPROJECT=ON ..
+cmake ${CMAKE_GEN} -DCMAKE_INSTALL_PREFIX="${INSTALL_PREFIX}" -DCMAKE_BUILD_TYPE=Release -DCMAKE_CXX_STANDARD=20 -DHELICS_BUILD_CXX_SHARED_LIB=ON -DHELICS_BUILD_EXAMPLES=OFF -DBUILD_TESTING=OFF -DHELICS_ZMQ_SUBPROJECT=ON ..
 cmake --build . --parallel
 
 # Install HELICS