diff --git a/build/ci.go b/build/ci.go
index 27589fc7f5..fcdd337888 100644
--- a/build/ci.go
+++ b/build/ci.go
@@ -173,19 +173,7 @@ func doInstall(cmdline []string) {
 	if flag.NArg() > 0 {
 		packages = flag.Args()
 	}
-
-	// Resolve ./... manually and remove vendor/bazil/fuse (fuse is not in windows)
-	out, err := goTool("list", "./...").CombinedOutput()
-	if err != nil {
-		log.Fatalf("package listing failed: %v\n%s", err, string(out))
-	}
-	packages = []string{}
-	for _, line := range strings.Split(string(out), "\n") {
-		if !strings.Contains(line, "vendor") {
-			packages = append(packages, strings.TrimSpace(line))
-		}
-	}
-
+	packages = build.ExpandPackagesNoVendor(packages)
 
 	if *arch == "" || *arch == runtime.GOARCH {
 		goinstall := goTool("install", buildFlags(env)...)
@@ -284,19 +272,8 @@ func doTest(cmdline []string) {
 	if len(flag.CommandLine.Args()) > 0 {
 		packages = flag.CommandLine.Args()
 	}
-	if len(packages) == 1 && packages[0] == "./..." {
-		// Resolve ./... manually since go vet will fail on vendored stuff
-		out, err := goTool("list", "./...").CombinedOutput()
-		if err != nil {
-			log.Fatalf("package listing failed: %v\n%s", err, string(out))
-		}
-		packages = []string{}
-		for _, line := range strings.Split(string(out), "\n") {
-			if !strings.Contains(line, "vendor") {
-				packages = append(packages, strings.TrimSpace(line))
-			}
-		}
-	}
+	packages = build.ExpandPackagesNoVendor(packages)
+
 	// Run analysis tools before the tests.
 	if *vet {
 		build.MustRun(goTool("vet", packages...))
diff --git a/internal/build/util.go b/internal/build/util.go
index 4df7b91381..44f6760b95 100644
--- a/internal/build/util.go
+++ b/internal/build/util.go
@@ -26,6 +26,7 @@ import (
 	"os"
 	"os/exec"
 	"path/filepath"
+	"runtime"
 	"strings"
 	"text/template"
 )
@@ -136,3 +137,30 @@ func CopyFile(dst, src string, mode os.FileMode) {
 		log.Fatal(err)
 	}
 }
+
+// ExpandPackagesNoVendor expands a cmd/go import path pattern, skipping
+// vendored packages.
+func ExpandPackagesNoVendor(patterns []string) []string {
+	expand := false
+	for _, pkg := range patterns {
+		if strings.Contains(pkg, "...") {
+			expand = true
+		}
+	}
+	if expand {
+		args := append([]string{"list"}, patterns...)
+		cmd := exec.Command(filepath.Join(runtime.GOROOT(), "bin", "go"), args...)
+		out, err := cmd.CombinedOutput()
+		if err != nil {
+			log.Fatalf("package listing failed: %v\n%s", err, string(out))
+		}
+		var packages []string
+		for _, line := range strings.Split(string(out), "\n") {
+			if !strings.Contains(line, "/vendor/") {
+				packages = append(packages, strings.TrimSpace(line))
+			}
+		}
+		return packages
+	}
+	return patterns
+}