@@ -358,11 +358,17 @@
 			    OF_STRINGIFY(__LINE__),			\
 			    "Failed to ensure condition:\n" #cond);	\
 	} while(0)
 #else
 @class OFConstantString;
+# ifdef __cplusplus
+extern "C" {
+# endif
 extern void OFLog(OFConstantString *_Nonnull, ...);
+# ifdef __cplusplus
+}
+# endif
 # define OFEnsure(cond)							\
 	do {								\
 		if OF_UNLIKELY (!(cond)) {				\
 			OFLog(@"Failed to ensure condition in "		\
 			    @__FILE__ ":%d: " @#cond, __LINE__);	\