diff --git a/build_full_test.mk b/build_full_test.mk
index 4cd1ac61b53..4e4b4e4bfd6 100644
--- a/build_full_test.mk
+++ b/build_full_test.mk
@@ -14,7 +14,7 @@
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 $(TEST)_INC := \
-	tests\test_common\common_config.h
+	tests/test_common/common_config.h
 
 $(TEST)_SRC := \
 	$(TMK_COMMON_SRC) \
@@ -33,4 +33,4 @@ $(TEST)_DEFS := $(TMK_COMMON_DEFS) $(OPT_DEFS)
 
 $(TEST)_CONFIG := $(TEST_PATH)/config.h
 
-VPATH += $(TOP_DIR)/tests/test_common
\ No newline at end of file
+VPATH += $(TOP_DIR)/tests/test_common