diff --git a/scripts/setup/al2/install_cbmc.sh b/scripts/setup/al2/install_cbmc.sh
index de4b5215e083..3bac22ace3db 100755
--- a/scripts/setup/al2/install_cbmc.sh
+++ b/scripts/setup/al2/install_cbmc.sh
@@ -93,6 +93,7 @@ cat > varargs.patch << "EOF"
    }
 
 EOF
+patch -p1 < varargs.patch
 
 cmake3 -S . -Bbuild -DWITH_JBMC=OFF -Dsat_impl="minisat2;cadical" \
   -DCMAKE_C_COMPILER=gcc10-cc -DCMAKE_CXX_COMPILER=gcc10-c++ \