diff --git a/src/cmd/go/internal/load/test.go b/src/cmd/go/internal/load/test.go
index 2864fb5ebb..aac7d7d481 100644
--- a/src/cmd/go/internal/load/test.go
+++ b/src/cmd/go/internal/load/test.go
@@ -405,7 +405,7 @@ func recompileForTest(pmain, preal, ptest, pxtest *Package) {
 		// covered packages are imported by pmain. Linking multiple packages
 		// compiled with '-p main' causes duplicate symbol errors.
 		// See golang.org/issue/30907, golang.org/issue/34114.
-		if p.Name == "main" && p != pmain {
+		if p.Name == "main" && p != pmain && p != ptest {
 			split()
 		}
 	}
diff --git a/src/cmd/go/testdata/script/list_split_main.txt b/src/cmd/go/testdata/script/list_split_main.txt
new file mode 100644
index 0000000000..74e7d5d74c
--- /dev/null
+++ b/src/cmd/go/testdata/script/list_split_main.txt
@@ -0,0 +1,25 @@
+# This test checks that a "main" package with an external test package
+# is recompiled only once.
+# Verifies golang.org/issue/34321.
+
+env GO111MODULE=off
+
+go list -e -test -deps -f '{{if not .Standard}}{{.ImportPath}}{{end}}' pkg
+cmp stdout want
+
+-- $GOPATH/src/pkg/pkg.go --
+package main
+
+func main() {}
+
+-- $GOPATH/src/pkg/pkg_test.go --
+package main
+
+import "testing"
+
+func Test(t *testing.T) {}
+
+-- want --
+pkg
+pkg [pkg.test]
+pkg.test