diff --git a/dasdview/dasdview.c b/dasdview/dasdview.c
index 94bfe599..0060a761 100644
--- a/dasdview/dasdview.c
+++ b/dasdview/dasdview.c
@@ -7,7 +7,6 @@
  * it under the terms of the MIT license. See LICENSE for details.
  */
 
-#define _LARGEFILE64_SOURCE    /* needed for unistd.h */
 #define _FILE_OFFSET_BITS 64   /* needed for unistd.h */
 
 #include <ctype.h>
@@ -1887,7 +1886,7 @@ static void dasdview_view_standard(dasdview_info_t *info)
 
 	/* seek in SEEK_STEP steps */
 	for (i = 1; i <= j; i++) {
-		rc = lseek64(fd, SEEK_STEP, SEEK_CUR);
+		rc = lseek(fd, SEEK_STEP, SEEK_CUR);
 		if (rc == -1) {
 			printf("*** rc: %d (%d) ***\n", rc, errno);
 			printf("*** j: %llu ***\n", j);
diff --git a/zipl/src/zipl-editenv.c b/zipl/src/zipl-editenv.c
index 05b59a6f..58c4da6a 100644
--- a/zipl/src/zipl-editenv.c
+++ b/zipl/src/zipl-editenv.c
@@ -128,7 +128,7 @@ static int envblk_update(struct zipl_envblk *zeb)
 	if (fs_map(zeb->mfd.fd, zeb->offset, &blknr, zeb->size) != 0)
 		goto error_close;
 
-	if (lseek64(dev_fd, blknr * (uint64_t)zeb->size, SEEK_SET) < 0) {
+	if (lseek(dev_fd, blknr * (off_t)zeb->size, SEEK_SET) < 0) {
 		error_reason(strerror(errno));
 		goto error_close;
 	}
diff --git a/zkey/Makefile b/zkey/Makefile
index 7211ad6c..3441a21d 100644
--- a/zkey/Makefile
+++ b/zkey/Makefile
@@ -37,7 +37,8 @@ endif
 
 libs = $(rootdir)/libutil/libutil.a
 
-ALL_CFLAGS += -DKMS_PLUGIN_LOCATION=\"$(ZKEYKMSPLUGINDIR)\"
+ALL_CFLAGS += -DKMS_PLUGIN_LOCATION=\"$(ZKEYKMSPLUGINDIR)\" \
+	-D_FILE_OFFSET_BITS=64
 
 detect-libcryptsetup.dep:
 	echo "#include <libcryptsetup.h>" > detect-libcryptsetup.dep
diff --git a/zkey/zkey-cryptsetup.c b/zkey/zkey-cryptsetup.c
index e81e88a5..632d3c2e 100644
--- a/zkey/zkey-cryptsetup.c
+++ b/zkey/zkey-cryptsetup.c
@@ -8,8 +8,6 @@
  * it under the terms of the MIT license. See LICENSE for details.
  */
 
-#define _LARGEFILE64_SOURCE
-
 #include <ctype.h>
 #include <dlfcn.h>
 #include <err.h>
@@ -547,10 +545,10 @@ static int keyfile_seek(int fd, size_t bytes)
 {
 	size_t next_read;
 	ssize_t bytes_r;
-	off64_t r;
+	off_t r;
 	char *tmp;
 
-	r = lseek64(fd, bytes, SEEK_CUR);
+	r = lseek(fd, bytes, SEEK_CUR);
 	if (r > 0)
 		return 0;
 	if (r < 0 && errno != ESPIPE)