diff --git a/go/analysis/internal/unitchecker/unitchecker_test.go b/go/analysis/internal/unitchecker/unitchecker_test.go
index a00ce4f2..7466cd8d 100644
--- a/go/analysis/internal/unitchecker/unitchecker_test.go
+++ b/go/analysis/internal/unitchecker/unitchecker_test.go
@@ -63,6 +63,8 @@ func main() {
 // analysis with facts using unitchecker under "go vet".
 // It fork/execs the main function above.
 func TestIntegration(t *testing.T) {
+	t.Skip("skipping broken test; golang.org/issue/28676")
+
 	if runtime.GOOS != "linux" {
 		t.Skipf("skipping fork/exec test on this platform")
 	}
diff --git a/go/packages/packages_test.go b/go/packages/packages_test.go
index 275e8899..f2399e84 100644
--- a/go/packages/packages_test.go
+++ b/go/packages/packages_test.go
@@ -9,6 +9,7 @@ import (
 	"encoding/json"
 	"fmt"
 	"go/ast"
+	"go/build"
 	constantpkg "go/constant"
 	"go/parser"
 	"go/token"
@@ -1221,6 +1222,9 @@ func TestName_ModulesDedup(t *testing.T) {
 
 func TestJSON(t *testing.T) { packagestest.TestAll(t, testJSON) }
 func testJSON(t *testing.T, exporter packagestest.Exporter) {
+	if !haveReleaseTag("go1.11") {
+		t.Skip("skipping; flaky before Go 1.11; https://golang.org/issue/28609")
+	}
 	//TODO: add in some errors
 	exported := packagestest.Export(t, exporter, []packagestest.Module{{
 		Name: "golang.org/fake",
@@ -1616,3 +1620,12 @@ func constant(p *packages.Package, name string) *types.Const {
 	}
 	return c.(*types.Const)
 }
+
+func haveReleaseTag(tag string) bool {
+	for _, v := range build.Default.ReleaseTags {
+		if tag == v {
+			return true
+		}
+	}
+	return false
+}