diff --git a/core/definitions.mk b/core/definitions.mk
index 330d360..95e9a02 100644
--- a/core/definitions.mk
+++ b/core/definitions.mk
@@ -2723,6 +2723,15 @@
   fi
 endef
 
+# Compress a package using the standard gzip algorithm.
+define compress-package
+$(hide) \
+  mv $@ $@.uncompressed; \
+  $(MINIGZIP) -c $@.uncompressed > $@.compressed; \
+  rm -f $@.uncompressed; \
+  mv $@.compressed $@;
+endef
+
 # Remove dynamic timestamps from packages
 #
 define remove-timestamps-from-package