diff --git a/TunnelKit.xcodeproj/project.pbxproj b/TunnelKit.xcodeproj/project.pbxproj
index aeca9bb..fe4a0a3 100644
--- a/TunnelKit.xcodeproj/project.pbxproj
+++ b/TunnelKit.xcodeproj/project.pbxproj
@@ -1822,7 +1822,7 @@
 				PRODUCT_BUNDLE_IDENTIFIER = com.algoritmico.apple.TunnelKit;
 				PRODUCT_NAME = TunnelKit;
 				SKIP_INSTALL = YES;
-				SWIFT_INCLUDE_PATHS = "$(SRCROOT)/TunnelKit/Sources";
+				SWIFT_INCLUDE_PATHS = "$(SRCROOT)/TunnelKit/Sources/**";
 				SWIFT_VERSION = 5.0;
 				TARGETED_DEVICE_FAMILY = "1,2";
 			};
@@ -1846,7 +1846,7 @@
 				PRODUCT_BUNDLE_IDENTIFIER = com.algoritmico.apple.TunnelKit;
 				PRODUCT_NAME = TunnelKit;
 				SKIP_INSTALL = YES;
-				SWIFT_INCLUDE_PATHS = "$(SRCROOT)/TunnelKit/Sources";
+				SWIFT_INCLUDE_PATHS = "$(SRCROOT)/TunnelKit/Sources/**";
 				SWIFT_VERSION = 5.0;
 				TARGETED_DEVICE_FAMILY = "1,2";
 			};
@@ -1871,7 +1871,7 @@
 				PRODUCT_NAME = TunnelKit;
 				SDKROOT = macosx;
 				SKIP_INSTALL = YES;
-				SWIFT_INCLUDE_PATHS = "$(SRCROOT)/TunnelKit/Sources";
+				SWIFT_INCLUDE_PATHS = "$(SRCROOT)/TunnelKit/Sources/**";
 				SWIFT_VERSION = 5.0;
 			};
 			name = Debug;
@@ -1895,7 +1895,7 @@
 				PRODUCT_NAME = TunnelKit;
 				SDKROOT = macosx;
 				SKIP_INSTALL = YES;
-				SWIFT_INCLUDE_PATHS = "$(SRCROOT)/TunnelKit/Sources";
+				SWIFT_INCLUDE_PATHS = "$(SRCROOT)/TunnelKit/Sources/**";
 				SWIFT_VERSION = 5.0;
 			};
 			name = Release;