diff --git a/openbsc/src/ipaccess/ipaccess-config.c b/openbsc/src/ipaccess/ipaccess-config.c
index 33dd82a..93fe442 100644
--- a/openbsc/src/ipaccess/ipaccess-config.c
+++ b/openbsc/src/ipaccess/ipaccess-config.c
@@ -496,7 +496,7 @@
 		return;
 	}
 
-	target = sub_entry->absolute_offset;
+	target = sub_entry->absolute_offset + ntohl(sub_entry->header_entry.start) + 4;
 	if (lseek(fd, target, SEEK_SET) != target) {
 		perror("seek failed");
 		close(out_fd);
diff --git a/openbsc/src/ipaccess/ipaccess-firmware.c b/openbsc/src/ipaccess/ipaccess-firmware.c
index d1004ea..bc40c1e 100644
--- a/openbsc/src/ipaccess/ipaccess-firmware.c
+++ b/openbsc/src/ipaccess/ipaccess-firmware.c
@@ -117,7 +117,7 @@
 
 		header_entry = talloc_zero(header,  struct sdp_header_item);
 		header_entry->header_entry = entry;
-		header_entry->absolute_offset = lseek(fd, 0, SEEK_CUR);
+		header_entry->absolute_offset = base_offset;
 		llist_add(&header_entry->entry, &header->header_list);
 
 		/* now we need to find the SDP file... */