diff --git a/target/sdk/Makefile b/target/sdk/Makefile
index d3552b47eb..2eaeef77aa 100644
--- a/target/sdk/Makefile
+++ b/target/sdk/Makefile
@@ -152,7 +152,7 @@ $(BIN_DIR)/$(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 'xz -T0 -7e' -cf $@ $(SDK_NAME); \
 	)
 
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