Index: src/OFMatrix4x4.h
==================================================================
--- src/OFMatrix4x4.h
+++ src/OFMatrix4x4.h
@@ -48,17 +48,20 @@
  * @param values A 2D array of 4x4 floats in row-major format
  * @return A new, autoreleased OFMatrix4x4
  */
 + (instancetype)matrixWithValues: (const float [_Nonnull 4][4])values;
 
+- (instancetype)init OF_UNAVAILABLE;
+
 /**
  * @brief Initializes an already allocated 4x4 matrix with the specified values.
  *
  * @param values A 2D array of 4x4 floats in row-major format
  * @return An initialized OFMatrix4x4
  */
-- (instancetype)initWithValues: (const float [_Nonnull 4][4])values;
+- (instancetype)initWithValues: (const float [_Nonnull 4][4])values
+    OF_DESIGNATED_INITIALIZER;
 
 /**
  * @brief Mulitplies the receiver with the specified matrix on the left side
  *	  and the receiver on the right side.
  *

Index: src/OFMatrix4x4.m
==================================================================
--- src/OFMatrix4x4.m
+++ src/OFMatrix4x4.m
@@ -35,10 +35,15 @@
 
 + (instancetype)matrixWithValues: (const float [4][4])values
 {
 	return [[[self alloc] initWithValues: values] autorelease];
 }
+
+- (instancetype)init
+{
+	OF_INVALID_INIT_METHOD
+}
 
 - (instancetype)initWithValues: (const float [4][4])values
 {
 	self = [super init];
 

Index: src/OFMethodSignature.h
==================================================================
--- src/OFMethodSignature.h
+++ src/OFMethodSignature.h
@@ -55,19 +55,22 @@
  * @return A new, autoreleased OFMethodSignature
  * @throw OFInvalidFormatException The type encoding is invalid
  */
 + (instancetype)signatureWithObjCTypes: (const char *)types;
 
+- (instancetype)init OF_UNAVAILABLE;
+
 /**
  * @brief Initializes an already allocated OFMethodSignature with the specified
  *	  ObjC types.
  *
  * @param types The ObjC types of the method
  * @return An Initialized OFMethodSignature
  * @throw OFInvalidFormatException The type encoding is invalid
  */
-- (instancetype)initWithObjCTypes: (const char *)types;
+- (instancetype)initWithObjCTypes: (const char *)types
+    OF_DESIGNATED_INITIALIZER;
 
 /**
  * @brief Returns the ObjC type for the argument at the specified index.
  *
  * @param index The index of the argument for which to return the ObjC type

Index: src/OFMethodSignature.m
==================================================================
--- src/OFMethodSignature.m
+++ src/OFMethodSignature.m
@@ -589,10 +589,15 @@
 @implementation OFMethodSignature
 + (instancetype)signatureWithObjCTypes: (const char*)types
 {
 	return [[[self alloc] initWithObjCTypes: types] autorelease];
 }
+
+- (instancetype)init
+{
+	OF_INVALID_INIT_METHOD
+}
 
 - (instancetype)initWithObjCTypes: (const char *)types
 {
 	self = [super init];