diff --git a/tools/kwbimage.c b/tools/kwbimage.c
index de7e9ac..92d163b 100644
--- a/tools/kwbimage.c
+++ b/tools/kwbimage.c
@@ -1948,7 +1948,7 @@
 	if (kwbimage_version(ptr) == 0) {
 		struct main_hdr_v0 *mhdr = (struct main_hdr_v0 *)ptr;
 
-		if (mhdr->ext & 0x1) {
+		if (mhdr->ext) {
 			struct ext_hdr_v0 *ext_hdr = (void *)(mhdr + 1);
 
 			csum = image_checksum8(ext_hdr, sizeof(*ext_hdr) - 1);
diff --git a/tools/kwbimage.h b/tools/kwbimage.h
index c000cba..9ebc7d7 100644
--- a/tools/kwbimage.h
+++ b/tools/kwbimage.h
@@ -208,7 +208,7 @@
 		const struct main_hdr_v0 *hdr = header;
 
 		return sizeof(*hdr) +
-		       (hdr->ext & 0x1) ? sizeof(struct ext_hdr_v0) : 0;
+		       hdr->ext ? sizeof(struct ext_hdr_v0) : 0;
 	} else {
 		const struct main_hdr_v1 *hdr = header;
 
@@ -252,7 +252,7 @@
 		return NULL;
 
 	mhdr = img;
-	if (mhdr->ext & 0x1)
+	if (mhdr->ext)
 		return (struct opt_hdr_v1 *)(mhdr + 1);
 	else
 		return NULL;
@@ -272,7 +272,7 @@
 
 static inline struct opt_hdr_v1 *opt_hdr_v1_next(struct opt_hdr_v1 *cur)
 {
-	if (*opt_hdr_v1_ext(cur) & 0x1)
+	if (*opt_hdr_v1_ext(cur))
 		return _opt_hdr_v1_next(cur);
 	else
 		return NULL;
diff --git a/tools/kwboot.c b/tools/kwboot.c
index d22e6ea..c3d8ab6 100644
--- a/tools/kwboot.c
+++ b/tools/kwboot.c
@@ -1398,7 +1398,7 @@
 	uint32_t ohdrsz;
 	uint8_t *prev_ext;
 
-	if (hdr->ext & 0x1) {
+	if (hdr->ext) {
 		for_each_opt_hdr_v1 (ohdr, img)
 			if (opt_hdr_v1_next(ohdr) == NULL)
 				break;
@@ -1422,7 +1422,7 @@
 	ohdrsz = sizeof(*ohdr) + 4 + 4 * num_args + binsz + 4;
 	kwboot_img_grow_hdr(hdr, size, ohdrsz);
 
-	*prev_ext |= 1;
+	*prev_ext = 1;
 
 	ohdr->headertype = OPT_HDR_V1_BINARY_TYPE;
 	ohdr->headersz_msb = ohdrsz >> 16;