diff --git a/internal/virtualenvironment/virtualenvironment.go b/internal/virtualenvironment/virtualenvironment.go
index 055bc890fc..90d9ea4b77 100644
--- a/internal/virtualenvironment/virtualenvironment.go
+++ b/internal/virtualenvironment/virtualenvironment.go
@@ -53,6 +53,9 @@ func (v *VirtualEnvironment) GetEnv(inherit bool, useExecutors bool, projectDir,
 			return envMap, locale.WrapError(err, "err_parse_project", "", configFile)
 		}
 		for _, constant := range pj.Constants() {
+			if !constant.Export() {
+				continue
+			}
 			v, err := constant.Value()
 			envMap[constant.Name()] = strings.Replace(v, "\n", `\n`, -1)
 			if err != nil {
diff --git a/pkg/project/project.go b/pkg/project/project.go
index 448ffb6206..db4b0a6411 100644
--- a/pkg/project/project.go
+++ b/pkg/project/project.go
@@ -369,6 +369,9 @@ func (c *Constant) Value() (string, error) {
 	return ExpandFromProject(c.constant.Value, c.project)
 }
 
+// Export returns whether or not the constant should be exported to an activated shell environment.
+func (c *Constant) Export() bool { return c.constant.ConstantFields.Export }
+
 // SecretScope defines the scope of a secret
 type SecretScope string
 
diff --git a/pkg/projectfile/projectfile.go b/pkg/projectfile/projectfile.go
index c89b2857e4..a47868ada5 100644
--- a/pkg/projectfile/projectfile.go
+++ b/pkg/projectfile/projectfile.go
@@ -113,6 +113,7 @@ type Build map[string]string
 // ConstantFields are the common fields for the Constant type. This is required
 // for type composition related to its yaml.Unmarshaler implementation.
 type ConstantFields struct {
+	Export      bool        `yaml:"export"`
 	Conditional Conditional `yaml:"if"`
 }
 
diff --git a/pkg/projectfile/projectfile_test.go b/pkg/projectfile/projectfile_test.go
index b3b9725d32..24fb183536 100644
--- a/pkg/projectfile/projectfile_test.go
+++ b/pkg/projectfile/projectfile_test.go
@@ -110,13 +110,15 @@ func TestConstantStruct(t *testing.T) {
 	constant := Constant{}
 	dat := strings.TrimSpace(`
 name: valueForName
-value: valueForConstant`)
+value: valueForConstant
+export: true`)
 
 	err := yaml.Unmarshal([]byte(dat), &constant)
 	assert.Nil(t, err, "Should not throw an error")
 
 	assert.Equal(t, "valueForName", constant.Name, "Name should be set")
 	assert.Equal(t, "valueForConstant", constant.Value, "Constant should be set")
+	assert.Equal(t, true, constant.Export, "Constant export should be set")
 }
 
 func TestSecretStruct(t *testing.T) {
@@ -150,6 +152,7 @@ func TestParse(t *testing.T) {
 
 	assert.NotEmpty(t, project.Constants[0].Name, "Constant name should be set")
 	assert.NotEmpty(t, project.Constants[0].Value, "Constant value should be set")
+	assert.False(t, project.Constants[0].Export, "Constant export value should not be set")
 
 	assert.NotEmpty(t, project.Secrets.User[0].Name, "Variable name should be set")
 	assert.NotEmpty(t, project.Secrets.Project[0].Name, "Variable name should be set")
diff --git a/test/integration/shell_int_test.go b/test/integration/shell_int_test.go
index f731c51ab4..9569bc5d4f 100644
--- a/test/integration/shell_int_test.go
+++ b/test/integration/shell_int_test.go
@@ -470,6 +470,47 @@ func (suite *ShellIntegrationTestSuite) TestProjectOrder() {
 	cp.ExpectNotExitCode(0)
 }
 
+func (suite *ShellIntegrationTestSuite) TestExportedConstants() {
+	suite.OnlyRunForTags(tagsuite.Shell)
+	ts := e2e.New(suite.T(), false)
+	defer ts.Close()
+
+	ts.PrepareProject("ActiveState-CLI/Perl-5.32", "a4762408-def6-41e4-b709-4cb548765005")
+	suite.Require().NoError(fileutils.AmendFile(filepath.Join(ts.Dirs.Work, constants.ConfigFileName), []byte(`
+constants:
+  - name: foo
+    value: bar
+  - name: baz
+    value: quux
+    export: true`), fileutils.AmendByAppend))
+
+	cp := ts.SpawnWithOpts(
+		e2e.OptArgs("shell"),
+		e2e.OptAppendEnv(constants.DisableRuntime+"=false"),
+	)
+	cp.Expect("Activated", e2e.RuntimeSourcingTimeoutOpt)
+
+	cp.ExpectInput()
+	if runtime.GOOS == "windows" {
+		cp.SendLine("echo %foo%")
+	} else {
+		cp.SendLine("echo $foo")
+	}
+	cp.ExpectInput()
+	suite.Assert().NotContains(cp.Snapshot(), "bar", "variable 'foo' was exported, but should not have been")
+
+	if runtime.GOOS == "windows" {
+		cp.SendLine("echo %baz%")
+	} else {
+		cp.SendLine("echo $baz")
+	}
+	cp.Expect("quux")
+
+	cp.SendLine("exit")
+	cp.Expect("Deactivated")
+	cp.ExpectExit() // exit code varies depending on shell; just assert the shell exited
+}
+
 func TestShellIntegrationTestSuite(t *testing.T) {
 	suite.Run(t, new(ShellIntegrationTestSuite))
 }