diff --git a/bootstrap/bpglob/bpglob.go b/bootstrap/bpglob/bpglob.go
index cb6633b..1097760 100644
--- a/bootstrap/bpglob/bpglob.go
+++ b/bootstrap/bpglob/bpglob.go
@@ -52,7 +52,7 @@ func (m *multiArg) Get() interface{} {
 }
 
 func usage() {
-	fmt.Fprintf(os.Stderr, "usage: bpglob -o out glob\n")
+	fmt.Fprintln(os.Stderr, "usage: bpglob -o out glob")
 	flag.PrintDefaults()
 	os.Exit(2)
 }
@@ -61,7 +61,7 @@ func main() {
 	flag.Parse()
 
 	if *out == "" {
-		fmt.Fprintf(os.Stderr, "error: -o is required\n")
+		fmt.Fprintln(os.Stderr, "error: -o is required")
 		usage()
 	}
 
diff --git a/bpfmt/bpfmt.go b/bpfmt/bpfmt.go
index ba4d9b3..17fe513 100644
--- a/bpfmt/bpfmt.go
+++ b/bpfmt/bpfmt.go
@@ -42,7 +42,7 @@ func usage() {
 
 func usageViolation(violation string) {
 	fmt.Fprintln(os.Stderr, violation)
-	fmt.Fprintf(os.Stderr, "usage: bpfmt [flags] [path ...]\n")
+	fmt.Fprintln(os.Stderr, "usage: bpfmt [flags] [path ...]")
 	flag.PrintDefaults()
 	os.Exit(2)
 }
diff --git a/bpmodify/bpmodify.go b/bpmodify/bpmodify.go
index 6a3c803..446034b 100644
--- a/bpmodify/bpmodify.go
+++ b/bpmodify/bpmodify.go
@@ -48,7 +48,7 @@ func report(err error) {
 }
 
 func usage() {
-	fmt.Fprintf(os.Stderr, "usage: bpmodify [flags] [path ...]\n")
+	fmt.Fprintln(os.Stderr, "usage: bpmodify [flags] [path ...]")
 	flag.PrintDefaults()
 	os.Exit(2)
 }
diff --git a/microfactory/microfactory_test.go b/microfactory/microfactory_test.go
index 083c9a6..8356adf 100644
--- a/microfactory/microfactory_test.go
+++ b/microfactory/microfactory_test.go
@@ -81,13 +81,13 @@ func TestBadPackagePathMap(t *testing.T) {
 		t.Error("Expected error with blank argument, but none returned")
 	}
 	if err := pkgMap.Set("a=a"); err != nil {
-		t.Error("Unexpected error: %v", err)
+		t.Errorf("Unexpected error: %v", err)
 	}
 	if err := pkgMap.Set("a=b"); err == nil {
 		t.Error("Expected error with duplicate package prefix, but none returned")
 	}
 	if _, ok, err := pkgMap.Path("testing"); err != nil {
-		t.Error("Unexpected error: %v", err)
+		t.Errorf("Unexpected error: %v", err)
 	} else if ok {
 		t.Error("Expected testing to be consider in the stdlib")
 	}
@@ -104,7 +104,7 @@ func TestSingleBuild(t *testing.T) {
 		pkg := loadPkg()
 
 		if err := pkg.Compile(config, filepath.Join(dir, "out")); err != nil {
-			t.Fatalf("Got error when compiling:", err)
+			t.Fatal("Got error when compiling:", err)
 		}
 
 		if err := pkg.Link(config, out); err != nil {