diff --git a/testing/makefiles/testcase.mk b/testing/makefiles/testcase.mk
index 4dded863..85b2632a 100644
--- a/testing/makefiles/testcase.mk
+++ b/testing/makefiles/testcase.mk
@@ -1,4 +1,4 @@
-top_dir         := $(dir $(lastword ${MAKEFILE_LIST}))../..
+top_dir         := $(abspath $(dir $(lastword ${MAKEFILE_LIST}))../..)
 
 
 build_dir := ${top_dir}/_build/${testcase}
diff --git a/tests/Makefile b/tests/Makefile
index cd135f19..88f513ca 100644
--- a/tests/Makefile
+++ b/tests/Makefile
@@ -1,4 +1,7 @@
-top_dir		:= $(abspath $(dir $(lastword ${MAKEFILE_LIST}))..)
+
+tests_dir	:= $(abspath $(dir $(lastword ${MAKEFILE_LIST})))
+
+top_dir		:= $(abspath $(tests_dir)/..)
 
 build_dir 	:= ${top_dir}/_build