diff --git a/src/cmd/go/internal/load/test.go b/src/cmd/go/internal/load/test.go
index a0e2750..e0f1332 100644
--- a/src/cmd/go/internal/load/test.go
+++ b/src/cmd/go/internal/load/test.go
@@ -191,6 +191,7 @@
 				GoFiles:    p.XTestGoFiles,
 				Imports:    p.XTestImports,
 				ForTest:    p.ImportPath,
+				Module:     p.Module,
 				Error:      pxtestErr,
 			},
 			Internal: PackageInternal{
@@ -222,6 +223,7 @@
 			ImportPath: p.ImportPath + ".test",
 			Root:       p.Root,
 			Imports:    str.StringList(TestMainDeps),
+			Module:     p.Module,
 		},
 		Internal: PackageInternal{
 			Build:      &build.Package{Name: "main"},
diff --git a/src/cmd/go/testdata/script/mod_list_test.txt b/src/cmd/go/testdata/script/mod_list_test.txt
index a99e4f3..f697af6 100644
--- a/src/cmd/go/testdata/script/mod_list_test.txt
+++ b/src/cmd/go/testdata/script/mod_list_test.txt
@@ -3,9 +3,19 @@
 # go list -compiled -test must handle test-only packages
 # golang.org/issue/27097.
 go list -compiled -test
+stdout -count=4 '^.' # 4 lines
 stdout '^m$'
 stdout '^m\.test$'
 stdout '^m \[m\.test\]$'
+stdout '^m_test \[m\.test\]$'
+
+# https://golang.org/issue/39974: test packages should have the Module field populated.
+go list -test -f '{{.ImportPath}}{{with .Module}}: {{.Path}}{{end}}'
+stdout -count=4 '^.' # 4 lines
+stdout '^m: m$'
+stdout '^m\.test: m$'
+stdout '^m \[m\.test\]: m$'
+stdout '^m_test \[m\.test\]: m$'
 
 -- go.mod --
 module m
@@ -14,3 +24,7 @@
 package x
 import "testing"
 func Test(t *testing.T) {}
+-- x_x_test.go --
+package x_test
+import "testing"
+func Test(t *testing.T) {}