1 files changed, 4 insertions, 0 deletions
diff --git a/src/mmap.c b/src/mmap.c
index 48e84ae..148b852 100644
--- a/src/mmap.c
+++ b/src/mmap.c
@@ -364,12 +364,16 @@ _gdbm_mapped_lseek (GDBM_FILE dbf, off_t offset, int whence)
  	    off_t file_size;
 	    if (_gdbm_file_size (dbf, &file_size))
 	      return -1;
 	    needle = file_size - offset; 
 	    break;
 	  }
+
+	default:
+	  errno = EINVAL;
+	  return -1;
 	}
 
       if (needle < 0)
 	{
 	  errno = EINVAL;
 	  return -1;