diff --git a/e2e/test_bootstrap.sh b/e2e/test_bootstrap.sh
index b1db98b5..5067fb65 100755
--- a/e2e/test_bootstrap.sh
+++ b/e2e/test_bootstrap.sh
@@ -42,6 +42,12 @@ sdists-repo/downloads/pbr-6.0.0.tar.gz
 
 work-dir/build-order.json
 work-dir/constraints.txt
+
+work-dir/flit_core-3.9.0/build.log
+work-dir/pbr-6.0.0/build.log
+work-dir/setuptools-70.0.0/build.log
+work-dir/stevedore-5.2.0/build.log
+work-dir/wheel-0.43.0/build.log
 "
 
 pass=true
diff --git a/e2e/test_build_with_build_order.sh b/e2e/test_build_with_build_order.sh
index fba26af0..bb7a70e4 100755
--- a/e2e/test_build_with_build_order.sh
+++ b/e2e/test_build_with_build_order.sh
@@ -126,6 +126,12 @@ sdists-repo/downloads/setuptools-70.0.0.tar.gz
 sdists-repo/downloads/wheel-0.43.0.tar.gz
 sdists-repo/downloads/flit_core-3.9.0.tar.gz
 sdists-repo/downloads/pbr-6.0.0.tar.gz
+
+work-dir/flit_core-3.9.0/build.log
+work-dir/pbr-6.0.0/build.log
+work-dir/setuptools-70.0.0/build.log
+work-dir/stevedore-5.2.0/build.log
+work-dir/wheel-0.43.0/build.log
 "
 
 pass=true
diff --git a/src/fromager/wheels.py b/src/fromager/wheels.py
index dbe688e5..ac12382c 100644
--- a/src/fromager/wheels.py
+++ b/src/fromager/wheels.py
@@ -34,6 +34,7 @@ def default_build_wheel(ctx, build_env, extra_environ, req, sdist_root_dir):
             '--wheel-dir', ctx.wheels_build,
             '--no-deps',
             '--index-url', ctx.wheel_server_url,  # probably redundant, but just in case
+            '--log', sdist_root_dir.parent / 'build.log',
             sdist_root_dir,
         ]
         external_commands.run(cmd, cwd=dir_name, extra_environ=extra_environ)