diff --git a/internal/fetchdatasource/fetchdatasource.go b/internal/fetchdatasource/fetchdatasource.go
index 896899d..69f803e 100644
--- a/internal/fetchdatasource/fetchdatasource.go
+++ b/internal/fetchdatasource/fetchdatasource.go
@@ -103,16 +103,15 @@
 	m, err := ds.fetch(ctx, modulePath, version)
 	if m != nil && ds.opts.ProxyClientForLatest != nil {
 		// Use the go.mod file at the raw latest version to fill in deprecation
-		// and retraction information.
-		lmv, err2 := fetch.LatestModuleVersions(ctx, modulePath, ds.opts.ProxyClientForLatest, nil)
-		if err2 != nil {
-			err = err2
-		} else {
+		// and retraction information. Ignore any problems getting the
+		// information, because we may be trying to do this for a local module
+		// that the proxy doesn't know about.
+		if lmv, err := fetch.LatestModuleVersions(ctx, modulePath, ds.opts.ProxyClientForLatest, nil); err == nil {
 			lmv.PopulateModuleInfo(&m.ModuleInfo)
 		}
 	}
 
-	// Don't cache cancellations.
+	// Cache both successes and failures, but not cancellations.
 	if !errors.Is(err, context.Canceled) {
 		ds.cachePut(modulePath, version, m, err)
 	}
diff --git a/internal/fetchdatasource/fetchdatasource_test.go b/internal/fetchdatasource/fetchdatasource_test.go
index c95ee2a..a1fc95c 100644
--- a/internal/fetchdatasource/fetchdatasource_test.go
+++ b/internal/fetchdatasource/fetchdatasource_test.go
@@ -338,7 +338,7 @@
 }
 
 func TestLocalGetUnitMeta(t *testing.T) {
-	ctx, ds, teardown := setup(t, nil, true)
+	ctx, ds, teardown := setup(t, defaultTestModules, true)
 	defer teardown()
 
 	sourceInfo := source.NewGitHubInfo("https://github.com/my/module", "", "v0.0.0")