diff --git a/CHANGELOG.md b/CHANGELOG.md
index d5b7adf2..7d32cf65 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,6 +3,7 @@
 ## Master
 
 - Fixed default settings for macOS unit-tests [387](https://github.com/yonaskolb/XcodeGen/pull/387) @frankdilo
+- Added default value for knownRegions property [390](https://github.com/yonaskolb/XcodeGen/pull/390) @Saik0s
 
 ## 1.11.1
 
diff --git a/Sources/XcodeGenKit/PBXProjGenerator.swift b/Sources/XcodeGenKit/PBXProjGenerator.swift
index b0068f0c..7c455193 100644
--- a/Sources/XcodeGenKit/PBXProjGenerator.swift
+++ b/Sources/XcodeGenKit/PBXProjGenerator.swift
@@ -228,7 +228,9 @@ public class PBXProjGenerator {
             .merged(project.attributes)
             .merged(generateTargetAttributes() ?? [:])
 
-        pbxProject.object.knownRegions = sourceGenerator.knownRegions.sorted()
+        let knownRegions = sourceGenerator.knownRegions.sorted()
+        pbxProject.object.knownRegions = knownRegions.isEmpty ? ["en"] : knownRegions
+
         let allTargets: [ObjectReference<PBXTarget>] = Array(targetObjects.values) + Array(targetAggregateObjects.values.map { ObjectReference(reference: $0.reference, object: $0.object) })
         pbxProject.object.targets = allTargets
             .sorted { $0.object.name < $1.object.name }