diff --git a/src/cmd/go/alldocs.go b/src/cmd/go/alldocs.go
index 9aac344a3f..b15b77fac8 100644
--- a/src/cmd/go/alldocs.go
+++ b/src/cmd/go/alldocs.go
@@ -1408,8 +1408,8 @@
 //
 // The rule for a match in the cache is that the run involves the same
 // test binary and the flags on the command line come entirely from a
-// restricted set of 'cacheable' test flags, defined as -cpu, -list,
-// -parallel, -run, -short, and -v. If a run of go test has any test
+// restricted set of 'cacheable' test flags, defined as -benchtime, -cpu,
+// -list, -parallel, -run, -short, and -v. If a run of go test has any test
 // or non-test flags outside this set, the result is not cached. To
 // disable test caching, use any test flag or argument other than the
 // cacheable flags. The idiomatic way to disable test caching explicitly
diff --git a/src/cmd/go/internal/test/test.go b/src/cmd/go/internal/test/test.go
index 230ea2d318..ebe13205f7 100644
--- a/src/cmd/go/internal/test/test.go
+++ b/src/cmd/go/internal/test/test.go
@@ -118,8 +118,8 @@ elapsed time in the summary line.
 
 The rule for a match in the cache is that the run involves the same
 test binary and the flags on the command line come entirely from a
-restricted set of 'cacheable' test flags, defined as -cpu, -list,
--parallel, -run, -short, and -v. If a run of go test has any test
+restricted set of 'cacheable' test flags, defined as -benchtime, -cpu,
+-list, -parallel, -run, -short, and -v. If a run of go test has any test
 or non-test flags outside this set, the result is not cached. To
 disable test caching, use any test flag or argument other than the
 cacheable flags. The idiomatic way to disable test caching explicitly
@@ -1333,7 +1333,8 @@ func (c *runCache) tryCacheWithID(b *work.Builder, a *work.Action, id string) bo
 			return false
 		}
 		switch arg[:i] {
-		case "-test.cpu",
+		case "-test.benchtime",
+			"-test.cpu",
 			"-test.list",
 			"-test.parallel",
 			"-test.run",
diff --git a/src/cmd/go/testdata/script/test_cache_inputs.txt b/src/cmd/go/testdata/script/test_cache_inputs.txt
index 50486e1909..d694a30994 100644
--- a/src/cmd/go/testdata/script/test_cache_inputs.txt
+++ b/src/cmd/go/testdata/script/test_cache_inputs.txt
@@ -99,6 +99,15 @@ rm $WORK/external.txt
 go test testcache -run=ExternalFile
 stdout '\(cached\)'
 
+# The -benchtime flag without -bench should not affect caching.
+go test testcache -run=Benchtime -benchtime=1x
+go test testcache -run=Benchtime -benchtime=1x
+stdout '\(cached\)'
+
+go test testcache -run=Benchtime -bench=Benchtime -benchtime=1x
+go test testcache -run=Benchtime -bench=Benchtime -benchtime=1x
+! stdout '\(cached\)'
+
 # Executables within GOROOT and GOPATH should affect caching,
 # even if the test does not stat them explicitly.
 
@@ -228,6 +237,10 @@ func TestExternalFile(t *testing.T) {
 func TestOSArgs(t *testing.T) {
 	t.Log(os.Args)
 }
+
+func TestBenchtime(t *testing.T) {
+}
+
 -- mkold.go --
 package main