diff --git a/make/defs.mk b/make/defs.mk
index 0bc4ebad..f01eeca1 100644
--- a/make/defs.mk
+++ b/make/defs.mk
@@ -397,9 +397,7 @@ DOCSUBDIRS            += $(wildcard html tex info examples src)
 
 BUILD_DOCDIR          ?= $(TOPDIR)/doc
 BUILD_DOC             ?= $(DOC_PREFIX)
-# TODO: use INSTALL_DOCDIR ?= $(DOC_PREFIX) which currently would break
-#       <MODULE>_VERSION below
-INSTALL_DOCDIR        ?= $(PREFIX)
+INSTALL_DOCDIR        ?= $(DOC_PREFIX)
 INSTALLED_DOC         ?= $(addprefix $(INSTALL_DOCDIR)/,$(DOCS))
 
 # -- LIB