diff --git a/called.go b/called.go
index b329086..9ad5b3c 100644
--- a/called.go
+++ b/called.go
@@ -55,7 +55,10 @@ func run(pass *analysis.Pass) (interface{}, error) {
 }
 
 func restrictedFuncs(pass *analysis.Pass, names string) []*types.Func {
-	var fs []*types.Func
+	var (
+		fs   []*types.Func
+		seen = map[*types.Func]struct{}{}
+	)
 	for _, fn := range strings.Split(names, ",") {
 		ss := strings.Split(strings.TrimSpace(fn), ".")
 
@@ -65,7 +68,10 @@ func restrictedFuncs(pass *analysis.Pass, names string) []*types.Func {
 		}
 		f, _ := analysisutil.ObjectOf(pass, ss[0], ss[1]).(*types.Func)
 		if f != nil {
-			fs = append(fs, f)
+			if _, ok := seen[f]; !ok {
+				fs = append(fs, f)
+				seen[f] = struct{}{}
+			}
 			continue
 		}
 
@@ -87,7 +93,10 @@ func restrictedFuncs(pass *analysis.Pass, names string) []*types.Func {
 
 		m := analysisutil.MethodOf(typ, ss[2])
 		if m != nil {
-			fs = append(fs, m)
+			if _, ok := seen[m]; !ok {
+				fs = append(fs, m)
+				seen[m] = struct{}{}
+			}
 		}
 	}
 
diff --git a/restrictedfuncs_test.go b/restrictedfuncs_test.go
new file mode 100644
index 0000000..c34945c
--- /dev/null
+++ b/restrictedfuncs_test.go
@@ -0,0 +1,26 @@
+package called
+
+import (
+	"testing"
+
+	"go/types"
+
+	"golang.org/x/tools/go/analysis"
+	"golang.org/x/tools/go/analysis/analysistest"
+)
+
+func TestRestrictedFuncsDuplicate(t *testing.T) {
+	testdata := analysistest.TestData()
+	var funcs []*types.Func
+	a := &analysis.Analyzer{
+		Name: "test",
+		Run: func(pass *analysis.Pass) (interface{}, error) {
+			funcs = restrictedFuncs(pass, "b.Func,b.Func,(*b.Type).Method,(*b.Type).Method,b/bsub.Type.Method,b/bsub.Type.Method")
+			return nil, nil
+		},
+	}
+	analysistest.Run(t, testdata, a, "a")
+	if len(funcs) != 3 {
+		t.Fatalf("expected 3 funcs, got %d", len(funcs))
+	}
+}