diff --git a/lib/install_champ.sh b/lib/install_champ.sh
index cf27b03..a3e3510 100755
--- a/lib/install_champ.sh
+++ b/lib/install_champ.sh
@@ -8,7 +8,7 @@ ln -s /usr/bin/python3 /usr/bin/python
 # Install dependencies
 # --------------------
 
-apt install -y cmake python3 git make gcc
+apt install -y cmake python3 git make gcc g++
 
 
 git clone --depth=1 https://github.com/filippi-claudia/champ.git
@@ -18,6 +18,7 @@ cd champ
 cmake -S. -Bbuild \
     -DCMAKE_Fortran_COMPILER="mpiifort" \
     -DCMAKE_C_COMPILER="gcc"
+    -DCMAKE_CXX_COMPILER="g++"
     -DENABLE_TREXIO=ON \
     -DENABLE_QMCKL=ON
 
@@ -25,4 +26,4 @@ cmake --build build -j 8
 
 rm -rf compile-* docs tests build lib
 
-apt remove -y cmake git make gcc
+apt remove -y cmake git make gcc g++