Index: src/autorelease.h
==================================================================
--- src/autorelease.h
+++ src/autorelease.h
@@ -26,11 +26,11 @@
 /*!
  * @brief Creates a new autorelease pool.
  *
  * @return An identifier for the created autorelease pool
  */
-extern void *objc_autoreleasePoolPush();
+extern void *objc_autoreleasePoolPush(void);
 
 /*!
  * @brief Drains an autorelease pool.
  *
  * @param pool An identifier for the pool to drain

Index: tests/OFBlockTests.m
==================================================================
--- tests/OFBlockTests.m
+++ tests/OFBlockTests.m
@@ -32,11 +32,11 @@
 
 extern void *_NSConcreteStackBlock;
 extern void *_NSConcreteGlobalBlock;
 extern void *_NSConcreteMallocBlock;
 
-static void (^g)() = ^ {};
+static void (^g)(void) = ^ {};
 
 static int
 (^returnStackBlock(void))(void)
 {
 	__block int i = 42;