diff --git a/src/cmd/go/internal/work/exec.go b/src/cmd/go/internal/work/exec.go
index 5b17ef4811..bacd06f468 100644
--- a/src/cmd/go/internal/work/exec.go
+++ b/src/cmd/go/internal/work/exec.go
@@ -1425,6 +1425,14 @@ func (b *Builder) printLinkerConfig(h io.Writer, p *load.Package) {
 			fmt.Fprintf(h, "GOEXPERIMENT=%q\n", cfg.CleanGOEXPERIMENT)
 		}
 
+		// The default godebug is embedded in the binary. For main packages it's
+		// already taken into account for the action id through the build info. But
+		// to make sure it's included for tests of other packages, where there's no
+		// build info, use it as part of the action id. See issue #69203.
+		if p != nil {
+			fmt.Fprintf(h, "default GODEBUG %q\n", p.DefaultGODEBUG)
+		}
+
 		// The linker writes source file paths that refer to GOROOT,
 		// but only if -trimpath is not specified (see [gctoolchain.ld] in gc.go).
 		gorootFinal := cfg.GOROOT
diff --git a/src/cmd/go/testdata/script/test_default_godebug_issue69203.txt b/src/cmd/go/testdata/script/test_default_godebug_issue69203.txt
new file mode 100644
index 0000000000..2e8d32dfc4
--- /dev/null
+++ b/src/cmd/go/testdata/script/test_default_godebug_issue69203.txt
@@ -0,0 +1,28 @@
+# This is the case reported in issue #69203. Setting GO111MODULE
+# off sets the Go version used to determine default GODEBUG settings
+# to Go 1.20, flipping the httplaxcontentlength godebug's value to "1".
+# Doing so causes net/http.TestReadResponseErrors to fail.
+# Before CL 610875, the default GODEBUG was only sometimes used to generate the actionID
+# for a link: if the binary being linked was package main, the default GODEBUG would be
+# embedded in the build info, which is in turn used for the action id. But for a test
+# of a non-main package, there would be no build info set and the default godebug would not
+# be taken into account in the action id. So if the only difference between a test run was the
+# default GODEBUG setting, the cached test result would be used (even though the
+# binaries were different because they contained different default GODEBUG values).
+# Now we explicitly add the default GODEBUG to the action id, so the test binaries' link actions
+# have different actionIDs. That means that the cached test results (whose action ids
+# are based on the test binaries' action ids) should only be used when the default GODEBUG matches.
+
+[short] skip 'runs go test'
+
+# Baseline: ensure TestReadResponseErrors fails with GODEBUG httplaxcontentlength=1.
+env GO111MODULE=off
+! go test net/http -run=^TestReadResponseErrors$
+
+# Ensure that it passes without httplaxcontentlength=1.
+env GO111MODULE=on
+go test net/http -run=^TestReadResponseErrors$
+
+# Make sure that the previous cached pass isn't reused when setting httplaxcontentlength=1.
+env GO111MODULE=off
+! go test net/http -run=^TestReadResponseErrors$