diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index d007d47..ae3bdae 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -27,6 +27,16 @@ jobs:
         run: echo ${{ matrix.compiler }} | awk '/^g/ { print "TOOLSET=gcc" } /^clang/ { print "TOOLSET=clang" }' >> $GITHUB_ENV
       - name: Install packages
         run: sudo apt-get update; sudo apt-get install -y g++-13 g++-14 clang-19 ${{matrix.mpi}}
+      - name: Fix noble mpich (LP 2072338)
+        if: matrix.mpi == 'mpich'
+        run: |
+          . /etc/os-release
+          if [ "$VERSION_ID" = "24.04" ]; then
+            wget -q https://launchpad.net/ubuntu/+source/mpich/4.2.0-5.1/+build/28285882/+files/libmpich12_4.2.0-5.1_amd64.deb https://launchpad.net/ubuntu/+source/mpich/4.2.0-5.1/+build/28285882/+files/libmpich-dev_4.2.0-5.1_amd64.deb https://launchpad.net/ubuntu/+source/mpich/4.2.0-5.1/+build/28285882/+files/mpich_4.2.0-5.1_amd64.deb
+            sudo dpkg -i libmpich12_4.2.0-5.1_amd64.deb libmpich-dev_4.2.0-5.1_amd64.deb mpich_4.2.0-5.1_amd64.deb
+          else
+            echo "Ubuntu $VERSION_ID is not 24.04; skipping the noble-specific mpich workaround (LP 2072338)."
+          fi
       - name: Checkout main boost
         run: git clone -b develop --depth 1 https://github.com/boostorg/boost.git ../boost-root
       - name: Update tools/boostdep
diff --git a/include/boost/graph/distributed/rmat_graph_generator.hpp b/include/boost/graph/distributed/rmat_graph_generator.hpp
index dec8250..b2f8c34 100644
--- a/include/boost/graph/distributed/rmat_graph_generator.hpp
+++ b/include/boost/graph/distributed/rmat_graph_generator.hpp
@@ -16,6 +16,7 @@
 #include <boost/assert.hpp>
 #include <boost/graph/parallel/algorithm.hpp>
 #include <boost/graph/parallel/process_group.hpp>
+#include <memory>
 #include <math.h>
 
 namespace boost {
@@ -151,7 +152,7 @@ namespace boost {
   private:
 
       // Parameters
-      shared_ptr<uniform_01<RandomGenerator> > gen;
+      std::shared_ptr<uniform_01<RandomGenerator> > gen;
 
       // Internal data structures
       std::vector<value_type> values;