diff --git a/mk/config.mk b/mk/config.mk
index 44a0987..6ce3b70 100644
--- a/mk/config.mk
+++ b/mk/config.mk
@@ -51,7 +51,6 @@ KBUILD=build/kernel
 export TARGET=$(ARCH)-unknown-redox
 BUILD=build/userspace
 INSTALLER=\
-	export REDOXER_TOOLCHAIN="$(ROOT)/$(PREFIX_INSTALL)" && \
 	export PATH="$(PREFIX_PATH):$$PATH" && \
  	installer/target/release/redox_installer $(INSTALLER_FLAGS)
 
diff --git a/mk/prefix.mk b/mk/prefix.mk
index cd7d99a..0e5ee33 100644
--- a/mk/prefix.mk
+++ b/mk/prefix.mk
@@ -5,6 +5,7 @@ PREFIX_PATH=$(ROOT)/$(PREFIX_INSTALL)/bin
 
 export PREFIX_RUSTFLAGS=-L $(ROOT)/$(PREFIX_INSTALL)/$(TARGET)/lib
 export RUSTUP_TOOLCHAIN=$(ROOT)/$(PREFIX_INSTALL)
+export REDOXER_TOOLCHAIN=$(RUSTUP_TOOLCHAIN)
 
 prefix: $(PREFIX_INSTALL)