diff --git a/target/imagebuilder/Makefile b/target/imagebuilder/Makefile
index b463feb456..ad19ab2b53 100644
--- a/target/imagebuilder/Makefile
+++ b/target/imagebuilder/Makefile
@@ -86,7 +86,10 @@ endif
 	(cd $(PKG_BUILD_DIR); find staging_dir/host/bin/ $(IB_LDIR)/scripts/dtc/ -type f | \
 		$(XARGS) $(SCRIPT_DIR)/bundle-libraries.sh $(PKG_BUILD_DIR)/staging_dir/host)
 	STRIP=sstrip $(SCRIPT_DIR)/rstrip.sh $(PKG_BUILD_DIR)/staging_dir/host/bin/
-	$(TAR) -cf - -C $(BUILD_DIR) $(IB_NAME) | xz -T$(if $(filter 1,$(NPROC)),2,0) -zc -7e > $@
+	(cd $(BUILD_DIR); \
+		tar -I '$(STAGING_DIR_HOST)/bin/xz -7e -T$(if $(filter 1,$(NPROC)),2,0)' -cf $@ $(IB_NAME) \
+		--mtime="$(shell date --date=@$(SOURCE_DATE_EPOCH))"; \
+	)
 
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 prepare:
diff --git a/target/sdk/Makefile b/target/sdk/Makefile
index d3552b47eb..022a791ebf 100644
--- a/target/sdk/Makefile
+++ b/target/sdk/Makefile
@@ -152,7 +152,8 @@ $(BIN_DIR)/$(SDK_NAME).tar.xz: clean
 	find $(SDK_BUILD_DIR) -name CVS | $(XARGS) rm -rf
 	-make -C $(SDK_BUILD_DIR)/scripts/config clean
 	(cd $(BUILD_DIR); \
-		tar -I 'xz -7e' -cf $@ $(SDK_NAME); \
+		tar -I '$(STAGING_DIR_HOST)/bin/xz -7e -T$(if $(filter 1,$(NPROC)),2,0)' -cf $@ $(SDK_NAME) \
+		--mtime="$(shell date --date=@$(SOURCE_DATE_EPOCH))"; \
 	)
 
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