diff --git a/source/trunk/src/Makefile b/source/trunk/src/Makefile
index fa6d5e9bb6511ea89b6f606ee377397fadff5a78..bfa87aee75d7c1ad2cf8f798382cbb65980985ef 100755
--- a/source/trunk/src/Makefile
+++ b/source/trunk/src/Makefile
@@ -43,7 +43,8 @@ OBJS		= CLASSLogger.o \
 OBJMODEL	=	$(EQM)/EQM_MLP_PWR_MOX.o $(EQM)/EQM_QUAD_PWR_MOX.o $(EQM)/EQM_POL_PWR_UO2.o\
 			$(EQM)/EQM_LIN_PWR_MOX.o $(EQM)/EQM_BakerRoss_FBR_MOX.o\
 			$(XSM)/XSM_MLP.o $(XSM)/XSM_CLOSEST.o \
-			$(IM)/IM_RK4.o $(IM)/IM_Matrix.o
+			$(IM)/IM_RK4.o $(IM)/IM_Matrix.o \
+			$(IM)/IM_Matrix_Decay.o
 
 
 ROOTOBJS	= 	CLASSLogger.o \