diff --git a/target/linux/ath79/image/generic.mk b/target/linux/ath79/image/generic.mk
index 525799e08b..510c8f87ee 100644
--- a/target/linux/ath79/image/generic.mk
+++ b/target/linux/ath79/image/generic.mk
@@ -155,9 +155,9 @@ define Build/xwrt_csac10-factory
   -[ -f "$@" ] && \
   mkdir -p "$@.tmp" && \
   mv "$@" "$@.tmp/UploadBrush-bin.img" && \
-  binmd5=$$($(STAGING_DIR_HOST)/bin/mkhash md5 "$@.tmp/UploadBrush-bin.img" | head -c32) && \
-  oemmd5=$$(echo -n TB-CSAC10-QCA9563_9886-ROUTE-CSAC10 | $(STAGING_DIR_HOST)/bin/mkhash md5 | head -c32) && \
-  echo -n $${binmd5}$${oemmd5} | $(STAGING_DIR_HOST)/bin/mkhash md5 | head -c32 >"$@.tmp/bin_random_oem.txt" && \
+  binmd5=$$($(MKHASH) md5 "$@.tmp/UploadBrush-bin.img" | head -c32) && \
+  oemmd5=$$(echo -n TB-CSAC10-QCA9563_9886-ROUTE-CSAC10 | $(MKHASH) md5 | head -c32) && \
+  echo -n $${binmd5}$${oemmd5} | $(MKHASH) md5 | head -c32 >"$@.tmp/bin_random_oem.txt" && \
   echo -n V4.4-201910201745 >"$@.tmp/version.txt" && \
   $(TAR) -czf $@.tmp.tgz -C "$@.tmp" UploadBrush-bin.img bin_random_oem.txt version.txt && \
   $(STAGING_DIR_HOST)/bin/openssl aes-256-cbc -md md5 -salt -in $@.tmp.tgz -out "$@" -k QiLunSmartWL && \
@@ -169,9 +169,9 @@ define Build/xwrt_csac05-factory
   -[ -f "$@" ] && \
   mkdir -p "$@.tmp" && \
   mv "$@" "$@.tmp/UploadBrush-bin.img" && \
-  binmd5=$$($(STAGING_DIR_HOST)/bin/mkhash md5 "$@.tmp/UploadBrush-bin.img" | head -c32) && \
-  oemmd5=$$(echo -n TB-CSAC05-QCA9563_9886-ROUTE-CSAC05 | $(STAGING_DIR_HOST)/bin/mkhash md5 | head -c32) && \
-  echo -n $${binmd5}$${oemmd5} | $(STAGING_DIR_HOST)/bin/mkhash md5 | head -c32 >"$@.tmp/bin_random_oem.txt" && \
+  binmd5=$$($(MKHASH) md5 "$@.tmp/UploadBrush-bin.img" | head -c32) && \
+  oemmd5=$$(echo -n TB-CSAC05-QCA9563_9886-ROUTE-CSAC05 | $(MKHASH) md5 | head -c32) && \
+  echo -n $${binmd5}$${oemmd5} | $(MKHASH) md5 | head -c32 >"$@.tmp/bin_random_oem.txt" && \
   echo -n V4.4-201910201745 >"$@.tmp/version.txt" && \
   $(TAR) -czf $@.tmp.tgz -C "$@.tmp" UploadBrush-bin.img bin_random_oem.txt version.txt && \
   $(STAGING_DIR_HOST)/bin/openssl aes-256-cbc -md md5 -salt -in $@.tmp.tgz -out "$@" -k QiLunSmartWL && \