diff --git a/lint.go b/lint.go
index 66fc69f..5749484 100644
--- a/lint.go
+++ b/lint.go
@@ -1038,14 +1038,17 @@
 	})
 }
 
-// lintErrorf examines errors.New calls. It complains if its only argument is an fmt.Sprintf invocation.
+// lintErrorf examines errors.New and testing.Error calls. It complains if its only argument is an fmt.Sprintf invocation.
 func (f *file) lintErrorf() {
 	f.walk(func(node ast.Node) bool {
 		ce, ok := node.(*ast.CallExpr)
-		if !ok {
+		if !ok || len(ce.Args) != 1 {
 			return true
 		}
-		if !isPkgDot(ce.Fun, "errors", "New") || len(ce.Args) != 1 {
+		isErrorsNew := isPkgDot(ce.Fun, "errors", "New")
+		se, ok := ce.Fun.(*ast.SelectorExpr)
+		isTestingError := ok && se.Sel.Name == "Error" && f.pkg.typeOf(se.X).String() == "*testing.T"
+		if !isErrorsNew && !isTestingError {
 			return true
 		}
 		arg := ce.Args[0]
@@ -1053,7 +1056,11 @@
 		if !ok || !isPkgDot(ce.Fun, "fmt", "Sprintf") {
 			return true
 		}
-		f.errorf(node, 1, category("errors"), "should replace errors.New(fmt.Sprintf(...)) with fmt.Errorf(...)")
+		errorfPrefix := "fmt"
+		if isTestingError {
+			errorfPrefix = f.render(se.X)
+		}
+		f.errorf(node, 1, category("errors"), "should replace %s(fmt.Sprintf(...)) with %s.Errorf(...)", f.render(se), errorfPrefix)
 		return true
 	})
 }
diff --git a/testdata/errorf.go b/testdata/errorf.go
index 2d26721..5a7efeb 100644
--- a/testdata/errorf.go
+++ b/testdata/errorf.go
@@ -1,4 +1,4 @@
-// Test for not using fmt.Errorf.
+// Test for not using fmt.Errorf or testing.Errorf.
 
 // Package foo ...
 package foo
@@ -6,6 +6,7 @@
 import (
 	"errors"
 	"fmt"
+	"testing"
 )
 
 func f(x int) error {
@@ -21,4 +22,19 @@
 	return nil
 }
 
+// TestF is a dummy test
+func TestF(t *testing.T) error {
+	x := 1
+	if x > 10 {
+		return t.Error(fmt.Sprintf("something %d", x)) // MATCH /should replace.*t\.Error\(fmt\.Sprintf\(\.\.\.\)\).*t\.Errorf\(\.\.\.\)/
+	}
+	if x > 5 {
+		return t.Error(g("blah")) // ok
+	}
+	if x > 4 {
+		return t.Error("something else") // ok
+	}
+	return nil
+}
+
 func g(s string) string { return "prefix: " + s }