diff --git a/Makefile b/Makefile
index 7b0ab7f..ebd5043 100644
--- a/Makefile
+++ b/Makefile
@@ -5,6 +5,8 @@
 
 # Configure make, can't use tabs here, than no indenting,
 # as white space is not for typing multiple white spaces. 
+MAKEFLAGS += --no-builtin-rules
+MAKEFLAGS += --no-builtin-variables
 .SUFFIXES:
 .PHONY: Makefile
 ifdef VERBOSE
diff --git a/lib/make/mb_assert.mk b/lib/make/mb_assert.mk
index 36e9b86..83fa70e 100644
--- a/lib/make/mb_assert.mk
+++ b/lib/make/mb_assert.mk
@@ -3,7 +3,7 @@ define mb_assert_flow_grep_binary
 $(1)/@assert-$(2): $(1)/@build
 	grep -q -U $(4) $(1)/$(3)
 	$$(call mb_make_call,mb_make_echo_assert,Assert succesfully @assert-$(2))
-MB_DOC_FIRE_TARGET += $$(call mb_make_call,mb_doc_target,$(1)/@assert-$(2),"Asserts that $(3) output matches.")
+$$(call mb_make_call,mb_doc_target,$(1)/@assert-$(2),"Asserts that $(3) output matches.")
 MB_PROJ_PHASE_TEST_DEPS += $(1)/@assert-$(2)
 .PHONY: $(1)/@assert-$(2)
 endef
@@ -17,7 +17,7 @@ $(1)-test-$(2)/@assert: $(1)/@build
 	$$(call mb_make_call,mb_msxpipe_safe_test,$(1)-test-$(2),$(3) > $(3).out)
 	grep -q $(4) $(1)-test-$(2)/$(3).out
 	$$(call mb_make_call,mb_make_echo_assert,Assert succesfully $(1)-test-$(2)/@assert)
-MB_DOC_FIRE_TARGET += $$(call mb_make_call,mb_doc_target,$(1)-test-$(2)/@assert,"Asserts that $(3) output matches.")
+$$(call mb_make_call,mb_doc_target,$(1)-test-$(2)/@assert,"Asserts that $(3) output matches.")
 MB_PROJ_PHASE_TEST_DEPS += $(1)-test-$(2)/@assert
 .PHONY: $(1)-test-$(2)/@assert
 endef