diff --git a/src/mapping.h b/src/mapping.h
index 763ca2c01c8fe51d70c7fc6b718be665241b4c88..969b520de964a839016b5867d8381258829c89ee 100644
--- a/src/mapping.h
+++ b/src/mapping.h
@@ -135,7 +135,6 @@ PMOD_EXPORT void really_free_mapping(struct mapping *md);
 }while(0)
 
 /* Prototypes begin here */
-void really_free_mapping(struct mapping * m);
 void count_memory_in_mappings(size_t * num, size_t * size);