diff --git a/src/delta.c b/src/delta.c
index 9382af85..c0b181e7 100644
--- a/src/delta.c
+++ b/src/delta.c
@@ -21,6 +21,7 @@
 #include <stdint.h>
 #include <string.h>
 #include "delta.h"
+#include "wolfboot/wolfboot.h"
 #include "image.h"
 
 
diff --git a/tools/delta/Makefile b/tools/delta/Makefile
index e7c446a1..7676cbb2 100644
--- a/tools/delta/Makefile
+++ b/tools/delta/Makefile
@@ -1,5 +1,14 @@
 all: bmdiff bmpatch
 CFLAGS+=-Wall -Werror -Wextra
+
+ifeq ($(HASH),SHA3)
+  WOLFCRYPT_OBJS+=./lib/wolfssl/wolfcrypt/src/sha3.o
+  CFLAGS+=-D"WOLFBOOT_HASH_SHA3_384"
+  SIGN_OPTIONS+=--sha3
+else
+  CFLAGS+=-D"WOLFBOOT_HASH_SHA256"
+endif
+
 bmdiff: delta.o bmdiff.o
 	gcc -o bmdiff delta.o bmdiff.o