diff --git a/src/misc/block.c b/src/misc/block.c
index 7d6713876862918c12be8afb27d2061f6adbc367..74da567145cc2149c9d00a768ac1d3f223b576c3 100644
--- a/src/misc/block.c
+++ b/src/misc/block.c
@@ -405,6 +405,8 @@ block_t *block_File(int fd, bool write)
         if (addr != MAP_FAILED)
             return block_mmap_Alloc (addr, length);
     }
+#else
+    (void) write;
 #endif
 
     /* If mmap() is not implemented by the OS _or_ the filesystem... */