@@ -1,15 +1,19 @@
 #import <ObjFW/ObjFW.h>
 
 #import "PGConnection.h"
+
+OF_ASSUME_NONNULL_BEGIN
 
 @interface PGException: OFException
 {
 	PGConnection *_connection;
 	OFString *_error;
 }
 
-@property (readonly, retain) PGConnection *connection;
+@property (readonly, nonatomic) PGConnection *connection;
 
-+ (instancetype)exceptionWithConnection: (PGConnection*)connection;
-- initWithConnection: (PGConnection*)connection;
++ (instancetype)exceptionWithConnection: (PGConnection *)connection;
+- initWithConnection: (PGConnection *)connection;
 @end
+
+OF_ASSUME_NONNULL_END