diff --git a/imports/fix.go b/imports/fix.go
index 4fc50570..1b021374 100644
--- a/imports/fix.go
+++ b/imports/fix.go
@@ -171,7 +171,7 @@ type pkg struct {
 	dir        string // absolute file path to pkg directory e.g. "/usr/lib/go/src/fmt"
 }
 
-var pkgIndexOnce sync.Once
+var pkgIndexOnce = &sync.Once{}
 
 var pkgIndex struct {
 	sync.Mutex
diff --git a/imports/fix_test.go b/imports/fix_test.go
index a1cedf91..20c5b34a 100644
--- a/imports/fix_test.go
+++ b/imports/fix_test.go
@@ -803,7 +803,7 @@ func TestFindImportGoPath(t *testing.T) {
 	}
 	defer os.RemoveAll(goroot)
 
-	pkgIndexOnce = sync.Once{}
+	pkgIndexOnce = &sync.Once{}
 
 	origStdlib := stdlib
 	defer func() {
@@ -858,7 +858,7 @@ type Buffer2 struct {}
 }
 
 func TestFindImportInternal(t *testing.T) {
-	pkgIndexOnce = sync.Once{}
+	pkgIndexOnce = &sync.Once{}
 	oldGOPATH := build.Default.GOPATH
 	build.Default.GOPATH = ""
 	defer func() {
@@ -892,7 +892,7 @@ func TestFindImportInternal(t *testing.T) {
 }
 
 func TestFindImportVendor(t *testing.T) {
-	pkgIndexOnce = sync.Once{}
+	pkgIndexOnce = &sync.Once{}
 	oldGOPATH := build.Default.GOPATH
 	build.Default.GOPATH = ""
 	defer func() {
@@ -926,7 +926,7 @@ func TestFindImportVendor(t *testing.T) {
 }
 
 func TestProcessVendor(t *testing.T) {
-	pkgIndexOnce = sync.Once{}
+	pkgIndexOnce = &sync.Once{}
 	oldGOPATH := build.Default.GOPATH
 	build.Default.GOPATH = ""
 	defer func() {