diff --git a/fuzz.go b/fuzz.go
index da0a5f9..3c1ba51 100644
--- a/fuzz.go
+++ b/fuzz.go
@@ -450,10 +450,10 @@ var fillFuncMap = map[reflect.Kind]func(reflect.Value, *rand.Rand){
 		v.SetFloat(r.Float64())
 	},
 	reflect.Complex64: func(v reflect.Value, r *rand.Rand) {
-		panic("unimplemented")
+		v.SetComplex(complex128(complex(r.Float32(), r.Float32())))
 	},
 	reflect.Complex128: func(v reflect.Value, r *rand.Rand) {
-		panic("unimplemented")
+		v.SetComplex(complex(r.Float64(), r.Float64()))
 	},
 	reflect.String: func(v reflect.Value, r *rand.Rand) {
 		v.SetString(randString(r))
diff --git a/fuzz_test.go b/fuzz_test.go
index 86ad2fa..b98ba63 100644
--- a/fuzz_test.go
+++ b/fuzz_test.go
@@ -39,6 +39,8 @@ func TestFuzz_basic(t *testing.T) {
 		S    string
 		B    bool
 		T    time.Time
+		C64  complex64
+		C128 complex128
 	}{}
 
 	failed := map[string]int{}
@@ -87,6 +89,12 @@ func TestFuzz_basic(t *testing.T) {
 		if n, v := "t", obj.T; v.IsZero() {
 			failed[n] = failed[n] + 1
 		}
+		if n, v := "c64", obj.C64; v == 0 {
+			failed[n] = failed[n] + 1
+		}
+		if n, v := "c128", obj.C128; v == 0 {
+			failed[n] = failed[n] + 1
+		}
 	}
 	checkFailed(t, failed)
 }