diff --git a/cmd/constable/main.go b/cmd/constable/main.go
index f732742..00c45b7 100644
--- a/cmd/constable/main.go
+++ b/cmd/constable/main.go
@@ -8,6 +8,7 @@ import (
 	"github.com/nnutter/constable/internal/analysis/predicates"
 	"github.com/nnutter/constable/internal/analysis/sumtype"
 	"github.com/nnutter/constable/internal/analysis/testify"
+	"github.com/nnutter/constable/internal/analysis/testifylint"
 	"github.com/nnutter/constable/internal/driver"
 )
 
@@ -26,5 +27,6 @@ func main() {
 		complexity.Analyzer,
 		errcheck.Analyzer,
 		sumtype.Analyzer,
+		testifylint.Analyzer,
 	)
 }
diff --git a/go.mod b/go.mod
index a736bb3..67a2278 100644
--- a/go.mod
+++ b/go.mod
@@ -5,6 +5,7 @@ go 1.27.3
 require (
 	github.com/alecthomas/go-check-sumtype v0.5.0
 	github.com/kisielk/errcheck v1.30.0
+	github.com/nnutter/testifylint v0.0.1
 	github.com/stretchr/testify v1.12.1
 	golang.org/x/tools v0.52.0
 )
diff --git a/go.sum b/go.sum
index 0f56789..642c552 100644
--- a/go.sum
+++ b/go.sum
@@ -4,6 +4,8 @@ github.com/google/go-cmp v0.7.0 h1:wk8382ETsv4JYUZwIsn6YpYiWiBsYLSJiTsyBybVuN8=
 github.com/google/go-cmp v0.7.0/go.mod h1:pXiqmnSA92OHEEa9HXL2W4E7lf9JzCmGVUdgjX3N/iU=
 github.com/kisielk/errcheck v1.30.0 h1:ZIxNDAfAd4larXHTceoZP/dYPAB90dHg1OYhA2sVh5k=
 github.com/kisielk/errcheck v1.30.0/go.mod h1:uiCAInmFuyOje4VDdbQSP9mgqf5gORYSXrDf19XilsI=
+github.com/nnutter/testifylint v0.0.1 h1:QhFq2HgC7LxnaG5Z1Gi4aYN42y+fywfMY+e9xTYe0WM=
+github.com/nnutter/testifylint v0.0.1/go.mod h1:DvNLVJQrA3YfswHJxaGzitfYt2gxFzlIs29buaH8sP4=
 github.com/stretchr/testify v1.12.1 h1:EuwCh5fleGS7H32xRwO3wRGT7DxrDhLAT6FF8MpWDWE=
 github.com/stretchr/testify v1.12.1/go.mod h1:MDEgiDPPsNp5cuIrHPPCyornHKgEVbtFUmoNlxoYthg=
 go.yaml.in/yaml/v3 v3.0.5 h1:N6y/pJk8buWs9NY5ERU2HSMfm+IuD/OtfdAnq6kESPw=
diff --git a/internal/analysis/testifylint/testdata/src/github.com/stretchr/testify/assert/assert.go b/internal/analysis/testifylint/testdata/src/github.com/stretchr/testify/assert/assert.go
new file mode 100644
index 0000000..31902b9
--- /dev/null
+++ b/internal/analysis/testifylint/testdata/src/github.com/stretchr/testify/assert/assert.go
@@ -0,0 +1,15 @@
+// Package assert is a stub of github.com/stretchr/testify/assert that holds
+// the calls the testdata makes. analysistest loads testdata in GOPATH mode, so
+// the testdata cannot import the real module.
+package assert
+
+// TestingT is the part of testing.T that the assertions use.
+type TestingT interface {
+	Errorf(format string, args ...any)
+}
+
+// True asserts that value is true.
+func True(t TestingT, value bool, msgAndArgs ...any) bool { return value }
+
+// NotEqual asserts that expected and actual are not equal.
+func NotEqual(t TestingT, expected, actual any, msgAndArgs ...any) bool { return true }
diff --git a/internal/analysis/testifylint/testdata/src/t/t.go b/internal/analysis/testifylint/testdata/src/t/t.go
new file mode 100644
index 0000000..3323833
--- /dev/null
+++ b/internal/analysis/testifylint/testdata/src/t/t.go
@@ -0,0 +1,11 @@
+package t
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestCompare(t *testing.T) {
+	assert.True(t, 1 != 2) // want `compares: use assert.NotEqual`
+}
diff --git a/internal/analysis/testifylint/testdata/src/t/zz_generated.go b/internal/analysis/testifylint/testdata/src/t/zz_generated.go
new file mode 100644
index 0000000..2e2eda8
--- /dev/null
+++ b/internal/analysis/testifylint/testdata/src/t/zz_generated.go
@@ -0,0 +1,13 @@
+// Code generated by hand. DO NOT EDIT.
+
+package t
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestGenerated(t *testing.T) {
+	assert.True(t, 1 != 2)
+}
diff --git a/internal/analysis/testifylint/testifylint.go b/internal/analysis/testifylint/testifylint.go
new file mode 100644
index 0000000..31539e6
--- /dev/null
+++ b/internal/analysis/testifylint/testifylint.go
@@ -0,0 +1,16 @@
+// Package testifylint adapts the testifylint analyzer to constable.
+//
+// constable embeds the analyzer from another module instead of reimplementing
+// it, so this package holds the places where constable's own policy differs
+// from the upstream default.
+package testifylint
+
+import (
+	"github.com/nnutter/testifylint/analyzer"
+
+	"github.com/nnutter/constable/internal/generated"
+)
+
+// Analyzer reports tests that misuse testify. It is the upstream analyzer with
+// constable's generated-file policy applied.
+var Analyzer = generated.Skip(analyzer.New())
diff --git a/internal/analysis/testifylint/testifylint_test.go b/internal/analysis/testifylint/testifylint_test.go
new file mode 100644
index 0000000..ef4ae5c
--- /dev/null
+++ b/internal/analysis/testifylint/testifylint_test.go
@@ -0,0 +1,13 @@
+package testifylint_test
+
+import (
+	"testing"
+
+	"golang.org/x/tools/go/analysis/analysistest"
+
+	"github.com/nnutter/constable/internal/analysis/testifylint"
+)
+
+func TestAnalyzer(t *testing.T) {
+	analysistest.Run(t, analysistest.TestData(), testifylint.Analyzer, "t")
+}