diff --git a/build_recipe_test.go b/build_recipe_test.go
index 82f4730..64518db 100644
--- a/build_recipe_test.go
+++ b/build_recipe_test.go
@@ -196,5 +196,7 @@ func TestBuildShipsSiblingPackages(t *testing.T) {
 		"COPY --chown=appuser code/src code/src",
 		"COPY --chown=appuser code/adapters code/adapters",
 		"COPY --chown=appuser code/model_service code/model_service",
+		// uvicorn's logging configuration and filter, written by the builder (uvicorn_logging.go).
+		"COPY --chown=appuser code/uvicorn-log-config.json code/codefly_uvicorn_logging.py ./",
 	}, copies)
 }
diff --git a/builder.go b/builder.go
index 63e1384..d1bca72 100644
--- a/builder.go
+++ b/builder.go
@@ -216,6 +216,14 @@ func (s *Builder) Build(ctx context.Context, req *builderv0.BuildRequest) (*buil
 	// A project that is a member of a uv workspace in the service is built from
 	// that workspace, copied whole (see enclosingUVWorkspace); its path sources
 	// must then stay inside the service the context carries.
+	// uvicorn's logging configuration and its filter module, written into the
+	// project exactly as a native start writes them, before any context is
+	// assembled from it: the build context is the service directory (or the
+	// assembled copy of it), and the Dockerfile copies them from code/ beside
+	// src (uvicorn_logging.go).
+	if err := writeUvicornLogging(s.SourceLocation); err != nil {
+		return s.Base.Builder.BuildError(err)
+	}
 	membership, err := enclosingUVWorkspace(s.Location, s.SourceLocation)
 	if err != nil {
 		return s.Base.Builder.BuildError(err)
@@ -259,11 +267,6 @@ func (s *Builder) Build(ctx context.Context, req *builderv0.BuildRequest) (*buil
 	if err := s.Base.Templates(ctx, docker, services.WithBuilder(builderFS).WithDestination("%s", outputDir)); err != nil {
 		return s.Base.Builder.BuildError(err)
 	}
-	// uvicorn's logging configuration and its filter module, which the
-	// Dockerfile copies beside the code (uvicorn_logging.go).
-	if err := writeUvicornLogging(outputDir); err != nil {
-		return s.Base.Builder.BuildError(err)
-	}
 	image := s.DockerImage(dockerRequest).FullName()
 	if assembled == nil {
 		// Only the Dockerfile and its ignore were written, and the application's
diff --git a/templates/builder/Dockerfile.tmpl b/templates/builder/Dockerfile.tmpl
index d32b544..7424678 100644
--- a/templates/builder/Dockerfile.tmpl
+++ b/templates/builder/Dockerfile.tmpl
@@ -76,8 +76,8 @@ WORKDIR /app/code
 
 # uvicorn's logging configuration and the filter it names (uvicorn_logging.go):
 # health probes are dropped from the access log, everything else is as uvicorn
-# writes it. Both files are rendered into the build context by the builder.
-COPY --chown=appuser uvicorn-log-config.json codefly_uvicorn_logging.py ./
+# writes it. The builder writes both into the project before the build.
+COPY --chown=appuser {{.ServicePrefix}}code/uvicorn-log-config.json {{.ServicePrefix}}code/codefly_uvicorn_logging.py ./
 
 # Default REST port (overridden by codefly at runtime).
 CMD ["uvicorn", "src.main:app", "--host", "0.0.0.0", "--port", "8080", "--log-config", "uvicorn-log-config.json"]