Index: src/OFKernelEventObserver_select.m
==================================================================
--- src/OFKernelEventObserver_select.m
+++ src/OFKernelEventObserver_select.m
@@ -77,11 +77,11 @@
 #endif
 
 	if (fd > _maxFD)
 		_maxFD = fd;
 
-	FD_SET(fd, &_readFDs);
+	FD_SET((of_socket_t)fd, &_readFDs);
 }
 
 - (void)OF_addObjectForWriting: (id <OFReadyForWritingObserving>)object
 {
 	int fd = [object fileDescriptorForWriting];
@@ -95,11 +95,11 @@
 #endif
 
 	if (fd > _maxFD)
 		_maxFD = fd;
 
-	FD_SET(fd, &_writeFDs);
+	FD_SET((of_socket_t)fd, &_writeFDs);
 }
 
 - (void)OF_removeObjectForReading: (id <OFReadyForReadingObserving>)object
 {
 	/* TODO: Adjust _maxFD */
@@ -112,11 +112,11 @@
 #ifndef OF_WINDOWS
 	if (fd >= FD_SETSIZE)
 		@throw [OFOutOfRangeException exception];
 #endif
 
-	FD_CLR(fd, &_readFDs);
+	FD_CLR((of_socket_t)fd, &_readFDs);
 }
 
 - (void)OF_removeObjectForWriting: (id <OFReadyForWritingObserving>)object
 {
 	/* TODO: Adjust _maxFD */
@@ -129,11 +129,11 @@
 #ifndef OF_WINDOWS
 	if (fd >= FD_SETSIZE)
 		@throw [OFOutOfRangeException exception];
 #endif
 
-	FD_CLR(fd, &_writeFDs);
+	FD_CLR((of_socket_t)fd, &_writeFDs);
 }
 
 - (void)observeForTimeInterval: (of_time_interval_t)timeInterval
 {
 	id const *objects;
@@ -192,11 +192,12 @@
 
 	for (size_t i = 0; i < count; i++) {
 		void *pool = objc_autoreleasePoolPush();
 		int fd = [objects[i] fileDescriptorForReading];
 
-		if (FD_ISSET(fd, &readFDs) && [_delegate respondsToSelector:
+		if (FD_ISSET((of_socket_t)fd, &readFDs) &&
+		    [_delegate respondsToSelector:
 		    @selector(objectIsReadyForReading:)])
 			[_delegate objectIsReadyForReading: objects[i]];
 
 		objc_autoreleasePoolPop(pool);
 	}
@@ -206,13 +207,14 @@
 
 	for (size_t i = 0; i < count; i++) {
 		void *pool = objc_autoreleasePoolPush();
 		int fd = [objects[i] fileDescriptorForWriting];
 
-		if (FD_ISSET(fd, &writeFDs) && [_delegate respondsToSelector:
+		if (FD_ISSET((of_socket_t)fd, &writeFDs) &&
+		    [_delegate respondsToSelector:
 		    @selector(objectIsReadyForWriting:)])
 			[_delegate objectIsReadyForWriting: objects[i]];
 
 		objc_autoreleasePoolPop(pool);
 	}
 }
 @end