diff --git a/Makefile b/Makefile
index 29bc88459dc13e8a2d93f929c84421dc5cfc1eda..f3a2ceddf4cc565cddad07d74fdb1dd262ac5a08 100644
--- a/Makefile
+++ b/Makefile
@@ -5,7 +5,7 @@ PROJNAME = cluster
 USRINCFLAGS = -I${INC_NEWMAT} -I${INC_PROB} -I${INC_ZLIB}
 USRLDFLAGS = -L${LIB_NEWMAT} -L${LIB_PROB} -L${LIB_ZLIB}
 
-LIBS = -lutils -lnewimage -lmiscmaths -lfslio -lniftiio -lznz -lnewmat -lz
+LIBS = -lutils -lnewimage -lmiscmaths -lprob -lfslio -lniftiio -lznz -lnewmat -lz
 
 IOBJS = infertest.o infer.o
 ILIBS = -lprob