Silence a compiler warning.
diff --git a/src/coredump/_UCD_access_mem.c b/src/coredump/_UCD_access_mem.c
index 82f0077..62d4183 100644
--- a/src/coredump/_UCD_access_mem.c
+++ b/src/coredump/_UCD_access_mem.c
@@ -52,7 +52,7 @@
 
  found: ;
 
-  const char *filename;
+  const char *filename UNUSED;
   off_t fileofs;
   int fd;
   if (addr_last >= phdr->p_vaddr + phdr->p_filesz)