diff --git a/libguile/_scm.h b/libguile/_scm.h
index c2823a272..a6316c0a8 100644
--- a/libguile/_scm.h
+++ b/libguile/_scm.h
@@ -145,6 +145,7 @@
 #define dirent_or_dirent64              CHOOSE_LARGEFILE(dirent,dirent64)
 #define fstat_or_fstat64                CHOOSE_LARGEFILE(fstat,fstat64)
 #define ftruncate_or_ftruncate64        CHOOSE_LARGEFILE(ftruncate,ftruncate64)
+#define lseek_or_lseek64                CHOOSE_LARGEFILE(lseek,lseek64)
 #define lstat_or_lstat64                CHOOSE_LARGEFILE(lstat,lstat64)
 #define off_t_or_off64_t                CHOOSE_LARGEFILE(off_t,off64_t)
 #define open_or_open64                  CHOOSE_LARGEFILE(open,open64)
@@ -160,13 +161,10 @@
 #if SIZEOF_OFF_T == 4
 #define scm_to_off_t    scm_to_int32
 #define scm_from_off_t  scm_from_int32
-#else
+#endif
 #if SIZEOF_OFF_T == 8
 #define scm_to_off_t    scm_to_int64
 #define scm_from_off_t  scm_from_int64
-#else
-#error sizeof(off_t) is not 4 or 8.
-#endif
 #endif