diff --git a/internal/pipe/build/build.go b/internal/pipe/build/build.go
index a5a03a33da8..9462eec1347 100644
--- a/internal/pipe/build/build.go
+++ b/internal/pipe/build/build.go
@@ -73,7 +73,7 @@ func buildWithDefaults(ctx *context.Context, build config.Build) (config.Build,
 		build.Binary = ctx.Config.ProjectName
 	}
 	if build.ID == "" {
-		build.ID = ctx.Config.ProjectName
+		build.ID = build.Binary
 	}
 	for k, v := range build.Env {
 		build.Env[k] = os.ExpandEnv(v)
diff --git a/internal/pipe/build/build_test.go b/internal/pipe/build/build_test.go
index 21cda8c2451..1fbb1ff86fb 100644
--- a/internal/pipe/build/build_test.go
+++ b/internal/pipe/build/build_test.go
@@ -288,6 +288,7 @@ func TestDefaultBuildID(t *testing.T) {
 			Builds: []config.Build{
 				{
 					Binary: "{{.Env.FOO}}",
+					ID:     "bar",
 				},
 				{
 					Binary: "bar",
@@ -295,9 +296,11 @@ func TestDefaultBuildID(t *testing.T) {
 			},
 		},
 	}
-	require.EqualError(t, Pipe{}.Default(ctx), "found 2 builds with the ID 'foo', please fix your config")
-	build := ctx.Config.Builds[0]
-	require.Equal(t, ctx.Config.ProjectName, build.ID)
+	require.EqualError(t, Pipe{}.Default(ctx), "found 2 builds with the ID 'bar', please fix your config")
+	build1 := ctx.Config.Builds[0].ID
+	build2 := ctx.Config.Builds[1].ID
+	require.Equal(t, build1, build2)
+	require.Equal(t, "bar", build2)
 }
 
 func TestSeveralBuildsWithTheSameID(t *testing.T) {
diff --git a/internal/pipe/universalbinary/universalbinary.go b/internal/pipe/universalbinary/universalbinary.go
index 696003516d5..2633039a6c8 100644
--- a/internal/pipe/universalbinary/universalbinary.go
+++ b/internal/pipe/universalbinary/universalbinary.go
@@ -140,7 +140,7 @@ func makeUniversalBinary(ctx *context.Context, opts *build.Options, unibin confi
 	}
 	opts.Name = name
 
-	path := filepath.Join(ctx.Config.Dist, name+"_darwin_all", name)
+	path := filepath.Join(ctx.Config.Dist, unibin.ID+"_darwin_all", name)
 	opts.Path = path
 	if err := os.MkdirAll(filepath.Dir(path), 0o755); err != nil {
 		return err
@@ -151,7 +151,9 @@ func makeUniversalBinary(ctx *context.Context, opts *build.Options, unibin confi
 		return pipe.Skip(fmt.Sprintf("no darwin binaries found with id %q", unibin.ID))
 	}
 
-	log.WithField("binary", path).Infof("creating from %d binaries", len(binaries))
+	log.WithField("id", unibin.ID).
+		WithField("binary", path).
+		Infof("creating from %d binaries", len(binaries))
 
 	var inputs []input
 	offset := int64(align)
diff --git a/internal/pipe/universalbinary/universalbinary_test.go b/internal/pipe/universalbinary/universalbinary_test.go
index 96a08211319..719a1d7b147 100644
--- a/internal/pipe/universalbinary/universalbinary_test.go
+++ b/internal/pipe/universalbinary/universalbinary_test.go
@@ -353,7 +353,7 @@ func TestRun(t *testing.T) {
 func checkUniversalBinary(tb testing.TB, unibin *artifact.Artifact) {
 	tb.Helper()
 
-	require.True(tb, strings.HasSuffix(unibin.Path, "foo_darwin_all/foo"))
+	require.True(tb, strings.HasSuffix(unibin.Path, unibin.ID()+"_darwin_all/foo"))
 	f, err := macho.OpenFat(unibin.Path)
 	require.NoError(tb, err)
 	require.Len(tb, f.Arches, 2)
diff --git a/www/docs/customization/build.md b/www/docs/customization/build.md
index 128334ceeb9..217ba5f2200 100644
--- a/www/docs/customization/build.md
+++ b/www/docs/customization/build.md
@@ -13,7 +13,7 @@ builds:
   # You can have multiple builds defined as a yaml list
   -
     # ID of the build.
-    # Defaults to the project name.
+    # Defaults to the binary name.
     id: "my-build"
 
     # Path to project's (sub)directory containing Go code.