diff --git a/unit_tests/Makefile b/unit_tests/Makefile
index 67512af..84a5132 100644
--- a/unit_tests/Makefile
+++ b/unit_tests/Makefile
@@ -16,5 +16,6 @@ endif
 CC   = $(CCPREFIX) $(TRGT)gcc
 CPPC = $(CCPREFIX) $(TRGT)g++
 
+vpath %.c ../src
 
-include rules.mk
\ No newline at end of file
+include rules.mk