diff --git a/Source/OCMock.xcodeproj/project.pbxproj b/Source/OCMock.xcodeproj/project.pbxproj
index e73da2e7..b88d6097 100644
--- a/Source/OCMock.xcodeproj/project.pbxproj
+++ b/Source/OCMock.xcodeproj/project.pbxproj
@@ -654,7 +654,7 @@
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 			shellPath = /bin/sh;
-			shellScript = "# Unpack frameworks required for this target\npushd \"${TARGET_BUILD_DIR}\"\nif [ ! -d Frameworks ]; then\nmkdir Frameworks\nfi\ncd Frameworks\nif [ ! -d  OCHamcrest.framework ]; then\ngnutar xjf \"${PROJECT_DIR}/Frameworks/OCHamcrest.tar.bz2\"\nfi\npopd\n";
+			shellScript = "# Unpack frameworks required for this target\npushd \"${TARGET_BUILD_DIR}\"\nif [ ! -d Frameworks ]; then\nmkdir Frameworks\nfi\ncd Frameworks\nif [ ! -d  OCHamcrest.framework ]; then\ntar xjf \"${PROJECT_DIR}/Frameworks/OCHamcrest.tar.bz2\"\nfi\npopd\n";
 		};
 /* End PBXShellScriptBuildPhase section */
 
diff --git a/Source/OCMock/OCMConstraint.m b/Source/OCMock/OCMConstraint.m
index b16a6789..db0d175a 100644
--- a/Source/OCMock/OCMConstraint.m
+++ b/Source/OCMock/OCMConstraint.m
@@ -18,6 +18,10 @@ - (BOOL)evaluate:(id)value
 	return NO;
 }
 
+- (id)copyWithZone:(struct _NSZone *)zone
+{
+    return [self retain];
+}
 
 + (id)constraintWithSelector:(SEL)aSelector onObject:(id)anObject
 {