diff --git a/Sources/ProjectSpec/Scheme.swift b/Sources/ProjectSpec/Scheme.swift
index 28c4a4ac..58f545f2 100644
--- a/Sources/ProjectSpec/Scheme.swift
+++ b/Sources/ProjectSpec/Scheme.swift
@@ -366,15 +366,31 @@ extension BuildType: JSONPrimitiveConvertible {
 
 extension XCScheme.EnvironmentVariable: JSONObjectConvertible, Equatable {
 
+    static private func parseValue(_ value: Any ) -> String {
+        if let bool = value as? Bool {
+            return bool ? "YES" : "NO"
+        } else {
+            return String(describing: value)
+        }
+    }
+
     public init(jsonDictionary: JSONDictionary) throws {
+
+        if let value = jsonDictionary["value"] {
+            self.value = XCScheme.EnvironmentVariable.parseValue(value)
+        } else {
+            // will throw error
+            value = try jsonDictionary.json(atKeyPath: "value")
+        }
         variable = try jsonDictionary.json(atKeyPath: "variable")
-        value = try jsonDictionary.json(atKeyPath: "value")
         enabled = (try? jsonDictionary.json(atKeyPath: "isEnabled")) ?? true
     }
 
     static func parseAll(jsonDictionary: JSONDictionary) throws -> [XCScheme.EnvironmentVariable] {
-        if let variablesDictionary: [String: String] = jsonDictionary.json(atKeyPath: "environmentVariables") {
-            return variablesDictionary.map { XCScheme.EnvironmentVariable(variable: $0.key, value: $0.value, enabled: true) }
+        if let variablesDictionary: [String: Any] = jsonDictionary.json(atKeyPath: "environmentVariables") {
+            return variablesDictionary.mapValues(parseValue)
+                .map { XCScheme.EnvironmentVariable(variable: $0.key, value: $0.value, enabled: true) }
+                .sorted { $0.variable < $1.variable }
         } else if let variablesArray: [JSONDictionary] = jsonDictionary.json(atKeyPath: "environmentVariables") {
             return try variablesArray.map(XCScheme.EnvironmentVariable.init)
         } else {
diff --git a/Tests/XcodeGenKitTests/SpecLoadingTests.swift b/Tests/XcodeGenKitTests/SpecLoadingTests.swift
index 8b64c9bc..20cc3e20 100644
--- a/Tests/XcodeGenKitTests/SpecLoadingTests.swift
+++ b/Tests/XcodeGenKitTests/SpecLoadingTests.swift
@@ -246,13 +246,17 @@ func specLoadingTests() {
                 ],
                 "run": [
                     "environmentVariables": [
+                        ["variable": "BOOL_TRUE", "value": true],
+                        ["variable": "BOOL_YES", "value": "YES"],
                         ["variable": "ENVIRONMENT", "value": "VARIABLE"],
                         ["variable": "OTHER_ENV_VAR", "value": "VAL", "isEnabled": false],
                     ],
                 ],
                 "test": [
                     "environmentVariables": [
-                        "TEST": "VARIABLE"
+                        "BOOL_TRUE": true,
+                        "BOOL_YES": "YES",
+                        "TEST": "VARIABLE",
                     ]
                 ],
                 "profile": [
@@ -263,11 +267,17 @@ func specLoadingTests() {
             let scheme = try Scheme(name: "Scheme", jsonDictionary: schemeDictionary)
 
             let expectedRunVariables = [
+                XCScheme.EnvironmentVariable(variable: "BOOL_TRUE", value: "YES", enabled: true),
+                XCScheme.EnvironmentVariable(variable: "BOOL_YES", value: "YES", enabled: true),
                 XCScheme.EnvironmentVariable(variable: "ENVIRONMENT", value: "VARIABLE", enabled: true),
                 XCScheme.EnvironmentVariable(variable: "OTHER_ENV_VAR", value: "VAL", enabled: false)
             ]
 
-            let expectedTestVariables = [XCScheme.EnvironmentVariable(variable: "TEST", value: "VARIABLE", enabled: true)]
+            let expectedTestVariables = [
+                XCScheme.EnvironmentVariable(variable: "BOOL_TRUE", value: "YES", enabled: true),
+                XCScheme.EnvironmentVariable(variable: "BOOL_YES", value: "YES", enabled: true),
+                XCScheme.EnvironmentVariable(variable: "TEST", value: "VARIABLE", enabled: true),
+            ]
 
             try expect(scheme.run?.environmentVariables) == expectedRunVariables
             try expect(scheme.test?.environmentVariables) == expectedTestVariables