@@ -82,11 +82,11 @@
 {
 	Class c;
 
 	if ((self = [super init])) {
 		if ((fp = fopen(path, mode)) == NULL) {
-			c = [self class];
+			c = isa;
 			[super free];
 			@throw [OFOpenFileFailedException newWithClass: c 
 							       andPath: path
 							       andMode: mode];
 		}
@@ -111,11 +111,11 @@
 	  intoBuffer: (char*)buf
 {
 	size_t ret;
 
 	if ((ret = fread(buf, size, nitems, fp)) == 0 && !feof(fp))
-		@throw [OFReadFailedException newWithClass: [self class]
+		@throw [OFReadFailedException newWithClass: isa
 						   andSize: size
 						 andNItems: nitems];
 
 	return ret;
 }
@@ -134,11 +134,11 @@
 {
 	size_t ret;
 
 	if ((ret = fwrite(buf, size, nitems, fp)) == 0 &&
 	    size != 0 && nitems != 0)
-		@throw [OFWriteFailedException newWithClass: [self class]
+		@throw [OFWriteFailedException newWithClass: isa
 						    andSize: size
 						  andNItems: nitems];
 
 	return ret;
 }