diff --git a/tools/Makefile b/tools/Makefile
index cbfca6dcb..0cc4cc9d1 100644
--- a/tools/Makefile
+++ b/tools/Makefile
@@ -137,7 +137,7 @@ $(obj)img2srec$(SFX):	$(obj)img2srec.o
 		$(CC) $(CFLAGS) $(HOST_LDFLAGS) -o $@ $^
 		$(STRIP) $@
 
-$(obj)mkimage$(SFX):	$(obj)mkimage.o $(obj)crc32.o $(obj)image.o
+$(obj)mkimage$(SFX):	$(obj)mkimage.o $(obj)crc32.o $(obj)image.o $(obj)sha1.o
 		$(CC) $(CFLAGS) $(HOST_LDFLAGS) -o $@ $^
 		$(STRIP) $@
 
diff --git a/tools/mkimage.h b/tools/mkimage.h
index 8b05bb17c..a01977ee6 100644
--- a/tools/mkimage.h
+++ b/tools/mkimage.h
@@ -32,6 +32,7 @@
 #include <sys/stat.h>
 #include <time.h>
 #include <unistd.h>
+#include <sha1.h>
 
 #if defined(__BEOS__) || defined(__NetBSD__) || defined(__APPLE__)
 #include <inttypes.h>