diff --git a/files.mk b/files.mk
index 5202ba0..586288e 100644
--- a/files.mk
+++ b/files.mk
@@ -1,7 +1,10 @@
-spiffs = ../generic/spiffs/src
+ifndef niffs
+$(warn defaulting path to generic spiffs module, spiffs variable not set)
+spiffs = ../generic/spiffs
+endif
 FLAGS	+= -DCONFIG_BUILD_SPIFFS
-INC	+= -I${spiffs}
-CPATH	+= ${spiffs}
+INC	+= -I${spiffs}/src
+CPATH	+= ${spiffs}/src
 CFILES	+= spiffs_nucleus.c
 CFILES	+= spiffs_gc.c
 CFILES	+= spiffs_hydrogen.c