@@ -1,14 +1,18 @@
 #import "PGException.h"
+
+OF_ASSUME_NONNULL_BEGIN
 
 @interface PGCommandFailedException: PGException
 {
 	OFString *_command;
 }
 
-@property (readonly, copy) OFString *command;
+@property (readonly, nonatomic) OFString *command;
 
-+ (instancetype)exceptionWithConnection: (PGConnection*)connection
-				command: (OFString*)command;
-- initWithConnection: (PGConnection*)connection
-	     command: (OFString*)command;
++ (instancetype)exceptionWithConnection: (PGConnection *)connection
+				command: (OFString *)command;
+- initWithConnection: (PGConnection *)connection
+	     command: (OFString *)command;
 @end
+
+OF_ASSUME_NONNULL_END