diff --git a/mk/prefix.mk b/mk/prefix.mk
index efe1edf5d..b3aeebd5c 100644
--- a/mk/prefix.mk
+++ b/mk/prefix.mk
@@ -32,7 +32,7 @@ UPSTREAM_RUSTC_VERSION=2026-05-24
 export PREFIX_RUSTFLAGS=-L $(ROOT)/$(PREFIX_INSTALL)/$(TARGET)/lib
 export RUSTUP_TOOLCHAIN=$(ROOT)/$(PREFIX_INSTALL)
 export REDOXER_TOOLCHAIN=$(RUSTUP_TOOLCHAIN)
-PREFIX_CONFIG=CI=1 COOKBOOK_CLEAN_TARGET=false COOKBOOK_VERBOSE=true COOKBOOK_NONSTOP=false
+PREFIX_CONFIG=CI=1 COOKBOOK_CLEAN_BUILD=true COOKBOOK_CLEAN_TARGET=false COOKBOOK_VERBOSE=true COOKBOOK_NONSTOP=false
 
 prefix: $(PREFIX)/sysroot