diff --git a/go/analysis/analysistest/analysistest_test.go b/go/analysis/analysistest/analysistest_test.go
index 30704c2a..5456fd9d 100644
--- a/go/analysis/analysistest/analysistest_test.go
+++ b/go/analysis/analysistest/analysistest_test.go
@@ -2,6 +2,8 @@ package analysistest_test
 
 import (
 	"fmt"
+	"log"
+	"os"
 	"reflect"
 	"strings"
 	"testing"
@@ -10,6 +12,18 @@ import (
 	"golang.org/x/tools/go/analysis/passes/findcall"
 )
 
+func init() {
+	// This test currently requires GOPATH mode.
+	// Explicitly disabling module mode should suffix, but
+	// we'll also turn off GOPROXY just for good measure.
+	if err := os.Setenv("GO111MODULE", "off"); err != nil {
+		log.Fatal(err)
+	}
+	if err := os.Setenv("GOPROXY", "off"); err != nil {
+		log.Fatal(err)
+	}
+}
+
 // TestTheTest tests the analysistest testing infrastructure.
 func TestTheTest(t *testing.T) {
 	// We'll simulate a partly failing test of the findcall analysis,