Index: src/OFDictionary.m
==================================================================
--- src/OFDictionary.m
+++ src/OFDictionary.m
@@ -35,11 +35,11 @@
 	Class isa;
 } placeholder;
 
 @interface OFDictionary ()
 - (OFString *)OF_JSONRepresentationWithOptions: (int)options
-					depth: (size_t)depth;
+					 depth: (size_t)depth;
 @end
 
 @interface OFDictionary_placeholder: OFDictionary
 @end
 

Index: src/macros.h
==================================================================
--- src/macros.h
+++ src/macros.h
@@ -177,10 +177,11 @@
 # define _Null_unspecified
 # define OF_NULLABLE_PROPERTY
 # define OF_NULL_RESETTABLE_PROPERTY
 # define nonnull
 # define nullable
+# define null_unspecified
 #endif
 
 #if __has_feature(objc_kindof)
 # define OF_KINDOF(cls) __kindof cls
 #else