diff --git a/platform/osd-merkur-256/Makefile.osd-merkur-256 b/platform/osd-merkur-256/Makefile.osd-merkur-256
index 8c67fa2df..f7ca409de 100644
--- a/platform/osd-merkur-256/Makefile.osd-merkur-256
+++ b/platform/osd-merkur-256/Makefile.osd-merkur-256
@@ -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
 CONTIKI_TARGET_SOURCEFILES += HardwareSerial.cpp HardwareSerial1.cpp
 # guh Source Files
 # Smart Grid Ready Interface