Index: src/OFThread.h
==================================================================
--- src/OFThread.h
+++ src/OFThread.h
@@ -61,11 +61,11 @@
 	id retval;
 #endif
 }
 
 /**
- * \param obj An object that is passed to the main method
+ * \param obj An object that is passed to the main method as a copy
  * \return A new, autoreleased thread
  */
 + threadWithObject: (id)obj;
 
 /**
@@ -87,11 +87,11 @@
  * \param key The Thread Local Storage key
  */
 + (id)objectForTLSKey: (OFTLSKey*)key;
 
 /**
- * \param obj An object that is passed to the main method
+ * \param obj An object that is passed to the main method as a copy
  * \return An initialized OFThread.
  */
 - initWithObject: (id)obj;
 
 /**

Index: src/OFThread.m
==================================================================
--- src/OFThread.m
+++ src/OFThread.m
@@ -81,11 +81,11 @@
 - initWithObject: (id)obj
 {
 	Class c;
 
 	self = [super init];
-	object = obj;
+	object = [obj copy];
 
 #ifndef _WIN32
 	if (pthread_create(&thread, NULL, call_main, self)) {
 #else
 	if ((thread =
@@ -141,10 +141,11 @@
 		TerminateThread(thread, 1);
 		CloseHandle(thread);
 	}
 #endif
 
+	[object release];
 	[super dealloc];
 }
 @end
 
 @implementation OFTLSKey