Index: src/OFObject.h
==================================================================
--- src/OFObject.h
+++ src/OFObject.h
@@ -667,11 +667,11 @@
  *
  * @param size The size of the memory to allocate
  * @return A pointer to the allocated memory. May return NULL if the specified
  *	   size is 0.
  */
-- (nullable void *)allocMemoryWithSize: (size_t)size;
+- (nullable void *)allocMemoryWithSize: (size_t)size OF_WARN_UNUSED_RESULT;
 
 /*!
  * @brief Allocates memory for the specified number of items and stores it in
  *	  the object's memory pool.
  *
@@ -681,11 +681,11 @@
  * @param count The number of items to allocate
  * @return A pointer to the allocated memory. May return NULL if the specified
  *	   size or count is 0.
  */
 - (nullable void *)allocMemoryWithSize: (size_t)size
-				 count: (size_t)count;
+				 count: (size_t)count OF_WARN_UNUSED_RESULT;
 
 /*!
  * @brief Resizes memory in the object's memory pool to the specified size.
  *
  * If the pointer is NULL, this is equivalent to allocating memory.
@@ -694,11 +694,11 @@
  * @param pointer A pointer to the already allocated memory
  * @param size The new size for the memory chunk
  * @return A pointer to the resized memory chunk
  */
 - (nullable void *)resizeMemory: (nullable void *)pointer
-			   size: (size_t)size;
+			   size: (size_t)size OF_WARN_UNUSED_RESULT;
 
 /*!
  * @brief Resizes memory in the object's memory pool to the specific number of
  *	  items of the specified size.
  *
@@ -710,11 +710,11 @@
  * @param count The number of items to resize to
  * @return A pointer to the resized memory chunk
  */
 - (nullable void *)resizeMemory: (nullable void *)pointer
 			   size: (size_t)size
-			  count: (size_t)count;
+			  count: (size_t)count OF_WARN_UNUSED_RESULT;
 
 /*!
  * @brief Frees allocated memory and removes it from the object's memory pool.
  *
  * Does nothing if the pointer is NULL.

Index: src/macros.h
==================================================================
--- src/macros.h
+++ src/macros.h
@@ -211,13 +211,15 @@
 #endif
 
 #if defined(__clang__) || OF_GCC_VERSION >= 406
 # define OF_SENTINEL __attribute__((__sentinel__))
 # define OF_NO_RETURN __attribute__((__noreturn__))
+# define OF_WARN_UNUSED_RESULT __attribute__((__warn_unused_result__))
 #else
 # define OF_SENTINEL
 # define OF_NO_RETURN
+# define OF_WARN_UNUSED_RESULT
 #endif
 
 #if __has_attribute(__unavailable__)
 # define OF_UNAVAILABLE __attribute__((__unavailable__))
 #else