diff --git a/src/libecoPCR/Makefile b/src/libecoPCR/Makefile
index 6553d1a..9a0713d 100644
--- a/src/libecoPCR/Makefile
+++ b/src/libecoPCR/Makefile
@@ -6,7 +6,8 @@ SOURCES = ecoapat.c \
          ecoMalloc.c \
          ecorank.c \
          ecoseq.c \
-         ecotax.c         
+         ecotax.c \
+         ecofilter.c       
 
 SRCS=$(SOURCES)