diff --git a/c/mapping/Makefile.am b/c/mapping/Makefile.am
index 4408f307d..b4303140c 100644
--- a/c/mapping/Makefile.am
+++ b/c/mapping/Makefile.am
@@ -1,5 +1,6 @@
 noinst_LTLIBRARIES=	libmapping.la
 libmapping_la_SOURCES=	\
+			context_flags.h \
 			rval_evaluator.h \
 			rval_evaluators.h \
 			rval_expr_evaluators.c \