diff --git a/c/mapping/Makefile.am b/c/mapping/Makefile.am
index a0994fa18..b7c47df19 100644
--- a/c/mapping/Makefile.am
+++ b/c/mapping/Makefile.am
@@ -15,7 +15,6 @@ libmapping_la_SOURCES=	\
 			mapper_check.c \
 			mapper_cut.c \
 			mapper_decimate.c \
-			mapper_filter.c \
 			mapper_grep.c \
 			mapper_group_like.c \
 			mapper_having_fields.c \
diff --git a/c/mapping/mapper_filter.c b/c/mapping/mapper_filter.c
deleted file mode 100644
index 85823e81d..000000000
--- a/c/mapping/mapper_filter.c
+++ /dev/null
@@ -1 +0,0 @@
-// xxx rm