Index: src/OFKernelEventObserver_epoll.m
==================================================================
--- src/OFKernelEventObserver_epoll.m
+++ src/OFKernelEventObserver_epoll.m
@@ -94,11 +94,11 @@
 	      events: (int)addEvents
 {
 	struct epoll_event event;
 	intptr_t events;
 
-	events = (intptr_t)[_FDToEvents valueForKey: (void*)(intptr_t)fd];
+	events = (intptr_t)[_FDToEvents valueForKey: (void*)((intptr_t)fd + 1)];
 
 	memset(&event, 0, sizeof(event));
 	event.events = (int)events | addEvents;
 	event.data.ptr = object;
 
@@ -106,29 +106,29 @@
 	    fd, &event) == -1)
 		@throw [OFObserveFailedException exceptionWithObserver: self
 								 errNo: errno];
 
 	[_FDToEvents setValue: (void*)(events | addEvents)
-		       forKey: (void*)(intptr_t)fd];
+		       forKey: (void*)((intptr_t)fd + 1)];
 }
 
 - (void)OF_removeObject: (id)object
 	 fileDescriptor: (int)fd
 		 events: (int)removeEvents
 {
 	intptr_t events;
 
-	events = (intptr_t)[_FDToEvents valueForKey: (void*)(intptr_t)fd];
+	events = (intptr_t)[_FDToEvents valueForKey: (void*)((intptr_t)fd + 1)];
 	events &= ~removeEvents;
 
 	if (events == 0) {
 		if (epoll_ctl(_epfd, EPOLL_CTL_DEL, fd, NULL) == -1)
 			@throw [OFObserveFailedException
 			    exceptionWithObserver: self
 					    errNo: errno];
 
-		[_FDToEvents removeValueForKey: (void*)(intptr_t)fd];
+		[_FDToEvents removeValueForKey: (void*)((intptr_t)fd + 1)];
 	} else {
 		struct epoll_event event;
 
 		memset(&event, 0, sizeof(event));
 		event.events = (int)events;
@@ -138,11 +138,11 @@
 			@throw [OFObserveFailedException
 			    exceptionWithObserver: self
 					    errNo: errno];
 
 		[_FDToEvents setValue: (void*)events
-			       forKey: (void*)(intptr_t)fd];
+			       forKey: (void*)((intptr_t)fd + 1)];
 	}
 }
 
 - (void)OF_addObjectForReading: (id <OFReadyForReadingObserving>)object
 {