@@ -13,11 +13,14 @@
  * Public License, either version 2 or 3, which can be found in the file
  * LICENSE.GPLv2 or LICENSE.GPLv3 respectively included in the packaging of this
  * file.
  */
 
-#import "OFString.h"
+#ifndef OBJFW_OF_CONSTANT_STRING_H
+#define OBJFW_OF_CONSTANT_STRING_H
+
+#include "OFString.h"
 
 OF_ASSUME_NONNULL_BEGIN
 
 #if !defined(OF_CONSTANT_STRING_M) && \
     defined(OF_APPLE_RUNTIME) && !defined(__OBJC2__)
@@ -28,10 +31,11 @@
 # ifdef __cplusplus
 }
 # endif
 #endif
 
+#ifdef __OBJC__
 /*!
  * @class OFConstantString OFConstantString.h ObjFW/OFConstantString.h
  *
  * @brief A class for storing constant strings using the `@""` literal.
  */
@@ -40,7 +44,10 @@
 {
 	char *_cString;
 	unsigned int _cStringLength;
 }
 @end
+#endif
 
 OF_ASSUME_NONNULL_END
+
+#endif