diff --git a/platform/osd-merkur-128/Makefile.osd-merkur-128 b/platform/osd-merkur-128/Makefile.osd-merkur-128
index 48881a6f0..f2b59bb8f 100644
--- a/platform/osd-merkur-128/Makefile.osd-merkur-128
+++ b/platform/osd-merkur-128/Makefile.osd-merkur-128
@@ -30,6 +30,7 @@ CONTIKI_TARGET_SOURCEFILES += relay.c relay-sensor.c
 CONTIKI_TARGET_SOURCEFILES += wiring_digital.c
 CONTIKI_TARGET_SOURCEFILES += new.cpp twi.c Wire.cpp WMath.cpp
 CONTIKI_TARGET_SOURCEFILES += Print.cpp Stream.cpp WString.cpp
+CONTIKI_TARGET_SOURCEFILES += SPI.cpp
 # guh Source Files
 # Smart Grid Ready Interface
 CONTIKI_TARGET_SOURCEFILES += sg-ready.c