diff --git a/build.mk b/build.mk
index d49fda2..8fd3413 100644
--- a/build.mk
+++ b/build.mk
@@ -23,6 +23,8 @@
 MKDIR = mkdir
 CHMOD = chmod
 SREC_CAT = srec_cat
+IHEX2BIN = ihex2bin
+BIN2IHEX = bin2ihex
 BIN2C = bin2c
 INSTALL = install
 TAR = tar