diff --git a/toolchain/Makefile b/toolchain/Makefile
index 36c6ed3..7f8d62f 100644
--- a/toolchain/Makefile
+++ b/toolchain/Makefile
@@ -74,7 +74,7 @@ endif
 
 # prerequisites for the individual targets
 $(curdir)/ := .config prereq
-$(curdir)//prepare = $(STAGING_DIR)/.prepared $(TOOLCHAIN_DIR)/info.mk
+$(curdir)//prepare = $(STAGING_DIR)/.prepared $(TOOLCHAIN_DIR)/info.mk $(tools/stamp-install)
 $(curdir)//compile = $(1)/prepare
 $(curdir)//install = $(1)/compile