diff --git a/Fixtures/TestProject/GeneratedProject.xcodeproj/project.pbxproj b/Fixtures/TestProject/GeneratedProject.xcodeproj/project.pbxproj
index 29435aad..7fa0aeae 100644
--- a/Fixtures/TestProject/GeneratedProject.xcodeproj/project.pbxproj
+++ b/Fixtures/TestProject/GeneratedProject.xcodeproj/project.pbxproj
@@ -10,8 +10,8 @@
 		BF1073850101 /* AppDelegate.swift in Sources */ = {isa = PBXBuildFile; fileRef = FR1332263601 /* AppDelegate.swift */; settings = {}; };
 		BF1744565901 /* ViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = FR6218091901 /* ViewController.swift */; settings = {}; };
 		BF2753556301 /* MyFramework.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = FR2993497801 /* MyFramework.framework */; };
-		BF2753556301 /* MyFramework.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = FR2993497801 /* MyFramework.framework */; settings = {ATTRIBUTES = (CodeSignOnCopy, RemoveHeadersOnCopy, ); }; };
 		BF2753556301 /* MyFramework.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = FR2993497801 /* MyFramework.framework */; };
+		BF2753556302 = {isa = PBXBuildFile; fileRef = FR2993497801 /* MyFramework.framework */; settings = {ATTRIBUTES = (CodeSignOnCopy, RemoveHeadersOnCopy, ); }; };
 		BF3154421201 /* Assets.xcassets in Resources */ = {isa = PBXBuildFile; fileRef = FR5980633301 /* Assets.xcassets */; settings = {}; };
 		BF3515549501 /* MyFramework.h in Headers */ = {isa = PBXBuildFile; fileRef = FR7740960501 /* MyFramework.h */; settings = {ATTRIBUTES = (Public, ); }; };
 		BF5986511201 = {isa = PBXBuildFile; fileRef = FR6523263101 /* TestProject.app */; };
@@ -44,7 +44,7 @@
 			dstPath = "";
 			dstSubfolderSpec = 10;
 			files = (
-				BF2753556301 /* MyFramework.framework in CopyFiles */,
+				BF2753556302 /* MyFramework.framework in CopyFiles */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};
@@ -53,10 +53,10 @@
 /* Begin PBXFileReference section */
 		FR1332263601 /* AppDelegate.swift */ = {isa = PBXFileReference; path = AppDelegate.swift; sourceTree = "<group>"; };
 		FR1345298501 /* Info.plist */ = {isa = PBXFileReference; path = Info.plist; sourceTree = "<group>"; };
-		FR1345298501 /* Info.plist */ = {isa = PBXFileReference; path = Info.plist; sourceTree = "<group>"; };
+		FR1345298502 /* Info.plist */ = {isa = PBXFileReference; path = Info.plist; sourceTree = "<group>"; };
 		FR2993497801 /* MyFramework.framework */ = {isa = PBXFileReference; explicitFileType = framework; includeInIndex = 0; path = MyFramework.framework; sourceTree = BUILT_PRODUCTS_DIR; };
 		FR3676338401 /* Base */ = {isa = PBXFileReference; name = Base; path = Base.lproj/LaunchScreen.storyboard; sourceTree = "<group>"; };
-		FR3676338401 /* Base */ = {isa = PBXFileReference; name = Base; path = Base.lproj/Main.storyboard; sourceTree = "<group>"; };
+		FR3676338402 /* Base */ = {isa = PBXFileReference; name = Base; path = Base.lproj/Main.storyboard; sourceTree = "<group>"; };
 		FR5980633301 /* Assets.xcassets */ = {isa = PBXFileReference; path = Assets.xcassets; sourceTree = "<group>"; };
 		FR6218091901 /* ViewController.swift */ = {isa = PBXFileReference; path = ViewController.swift; sourceTree = "<group>"; };
 		FR6523263101 /* TestProject.app */ = {isa = PBXFileReference; explicitFileType = app; includeInIndex = 0; path = TestProject.app; sourceTree = BUILT_PRODUCTS_DIR; };
@@ -87,7 +87,7 @@
 			isa = PBXGroup;
 			children = (
 				FR7078510801 /* FrameworkFile.swift */,
-				FR1345298501 /* Info.plist */,
+				FR1345298502 /* Info.plist */,
 				FR7740960501 /* MyFramework.h */,
 			);
 			name = MyFramework;
@@ -156,7 +156,7 @@
 				HBP299349701 /* Headers */,
 				FBP299349701 /* Frameworks */,
 				CFBP29934901 /* Copy Files */,
-				SSBP25860701 /* Run Script */,
+				SSBP25860702 /* Run Script */,
 			);
 			buildRules = (
 			);
@@ -241,7 +241,7 @@
 			shellPath = /bin/sh;
 			shellScript = "if which swiftlint >/dev/null; then\n  swiftlint\nelse\n  echo \"warning: SwiftLint not installed, download from https://github.com/realm/SwiftLint\"\nfi\n";
 		};
-		SSBP25860701 /* Run Script */ = {
+		SSBP25860702 /* Run Script */ = {
 			isa = PBXShellScriptBuildPhase;
 			buildActionMask = 2147483647;
 			files = (
@@ -289,7 +289,7 @@
 		VG1473702401 /* Main.storyboard */ = {
 			isa = PBXVariantGroup;
 			children = (
-				FR3676338401 /* Base */,
+				FR3676338402 /* Base */,
 			);
 			name = Main.storyboard;
 			sourceTree = "<group>";
@@ -356,7 +356,7 @@
 			};
 			name = Debug;
 		};
-		XCBC47994501 /* Debug */ = {
+		XCBC47994502 /* Debug */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
@@ -369,7 +369,7 @@
 			};
 			name = Debug;
 		};
-		XCBC47994501 /* Debug */ = {
+		XCBC47994503 /* Debug */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
@@ -430,7 +430,7 @@
 			};
 			name = Release;
 		};
-		XCBC88111401 /* Release */ = {
+		XCBC88111402 /* Release */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
@@ -443,7 +443,7 @@
 			};
 			name = Release;
 		};
-		XCBC88111401 /* Release */ = {
+		XCBC88111403 /* Release */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
@@ -466,8 +466,8 @@
 		XCCL29934901 /* Build configuration list for PBXNativeTarget "MyFramework" */ = {
 			isa = XCConfigurationList;
 			buildConfigurations = (
-				XCBC88111401 /* Release */,
-				XCBC47994501 /* Debug */,
+				XCBC88111403 /* Release */,
+				XCBC47994503 /* Debug */,
 			);
 			defaultConfigurationIsVisible = 0;
 			defaultConfigurationName = "";
@@ -475,8 +475,8 @@
 		XCCL65232601 /* Build configuration list for PBXNativeTarget "TestProject" */ = {
 			isa = XCConfigurationList;
 			buildConfigurations = (
-				XCBC88111401 /* Release */,
-				XCBC47994501 /* Debug */,
+				XCBC47994502 /* Debug */,
+				XCBC88111402 /* Release */,
 			);
 			defaultConfigurationIsVisible = 0;
 			defaultConfigurationName = "";
diff --git a/Sources/XcodeGenKit/PBXProjGenerator.swift b/Sources/XcodeGenKit/PBXProjGenerator.swift
index 6318ab10..957ca443 100644
--- a/Sources/XcodeGenKit/PBXProjGenerator.swift
+++ b/Sources/XcodeGenKit/PBXProjGenerator.swift
@@ -52,6 +52,7 @@ public class PBXProjGenerator {
             counter += 1
             uuid = "\(classAcronym)\(stringID)\(String(format: "%02d", counter))"
         } while (uuids.contains(uuid))
+        uuids.insert(uuid)
         return uuid
     }