diff --git a/configure.in b/configure.in
index ac3cd92..181faeb 100644
--- a/configure.in
+++ b/configure.in
@@ -970,14 +970,17 @@ AC_CHECK_SIZEOF(short)
 AC_CHECK_SIZEOF(int)
 AC_CHECK_SIZEOF(long)
 AC_CHECK_SIZEOF(long long)
+AC_CHECK_SIZEOF(off_t)
 SIZEOF_SHORT=$ac_cv_sizeof_short
 SIZEOF_INT=$ac_cv_sizeof_int
 SIZEOF_LONG=$ac_cv_sizeof_long
 SIZEOF_LONG_LONG=$ac_cv_sizeof_long_long
+SIZEOF_OFF_T=$ac_cv_sizeof_off_t
 AC_SUBST(SIZEOF_SHORT)
 AC_SUBST(SIZEOF_INT)
 AC_SUBST(SIZEOF_LONG)
 AC_SUBST(SIZEOF_LONG_LONG)
+AC_SUBST(SIZEOF_OFF_T)
 AC_C_BIGENDIAN
 BUILD_CC="$BUILD_CC" CPP="$CPP" /bin/sh $ac_aux_dir/parse-types.sh
 ASM_TYPES_HEADER=./asm_types.h
diff --git a/lib/config.h.in b/lib/config.h.in
index 6f88c9c..eebb75d 100644
--- a/lib/config.h.in
+++ b/lib/config.h.in
@@ -552,6 +552,9 @@
 /* The size of `long long', as computed by sizeof. */
 #undef SIZEOF_LONG_LONG
 
+/* The size of `off_t', as computed by sizeof. */
+#undef SIZEOF_OFF_T
+
 /* The size of `short', as computed by sizeof. */
 #undef SIZEOF_SHORT
 
diff --git a/lib/ext2fs/llseek.c b/lib/ext2fs/llseek.c
index b0576e4..e5cb784 100644
--- a/lib/ext2fs/llseek.c
+++ b/lib/ext2fs/llseek.c
@@ -90,18 +90,14 @@ static ext2_loff_t my_llseek (int fd, ext2_loff_t offset, int origin)
 
 ext2_loff_t ext2fs_llseek (int fd, ext2_loff_t offset, int origin)
 {
+#if SIZEOF_OFF_T >= SIZEOF_LONG_LONG
+	return lseek (fd, offset, origin);
+#else
 	ext2_loff_t result;
 	static int do_compat = 0;
 
-	if ((sizeof(off_t) >= sizeof(ext2_loff_t)) ||
-	    (offset < ((ext2_loff_t) 1 << ((sizeof(off_t)*8) -1))))
+	if (do_compat)
 		return lseek(fd, (off_t) offset, origin);
-
-	if (do_compat) {
-		errno = EINVAL;
-		return -1;
-	}
-
 	result = my_llseek (fd, offset, origin);
 	if (result == -1 && errno == ENOSYS) {
 		/*
@@ -112,6 +108,7 @@ ext2_loff_t ext2fs_llseek (int fd, ext2_loff_t offset, int origin)
 		errno = EINVAL;
 	}
 	return result;
+#endif
 }
 
 #else /* !linux */