diff --git a/core/wakaama.cmake b/core/wakaama.cmake
index 416fec87c..e70d73fc7 100644
--- a/core/wakaama.cmake
+++ b/core/wakaama.cmake
@@ -37,8 +37,11 @@ if(NOT DEFINED LWM2M_LITTLE_ENDIAN)
          set(LWM2M_LITTLE_ENDIAN TRUE)
     endif()
 endif()
+
 if (LWM2M_LITTLE_ENDIAN)
     set(WAKAAMA_DEFINITIONS ${WAKAAMA_DEFINITIONS} -DLWM2M_LITTLE_ENDIAN)
+else()
+    set(WAKAAMA_DEFINITIONS ${WAKAAMA_DEFINITIONS} -DLWM2M_BIG_ENDIAN)
 endif()
 
 # Set the LWM2M version