diff --git a/libs/sofia-sip/libsofia-sip-ua/nua/Makefile.am b/libs/sofia-sip/libsofia-sip-ua/nua/Makefile.am
index a89480a864..ed1844e2c5 100644
--- a/libs/sofia-sip/libsofia-sip-ua/nua/Makefile.am
+++ b/libs/sofia-sip/libsofia-sip-ua/nua/Makefile.am
@@ -43,9 +43,11 @@ libnua_la_SOURCES = 	nua.c nua_stack.h nua_common.c nua_stack.c \
 
 COVERAGE_INPUT = 	$(libnua_la_SOURCES) $(include_sofia_HEADERS)
 
+# ----------------------------------------------------------------------
+
 check_nua_SOURCES = 	check_nua.c check_nua.h \
 			check_session.c check_register.c \
-			check_etsi.c \
+			check_etsi.c check_simple.c \
 			test_s2.h test_s2.c
 
 check_nua_LDADD = 	$(nua_libs) @CHECK_LIBS@
diff --git a/libs/sofia-sip/libsofia-sip-ua/nua/check_nua.c b/libs/sofia-sip/libsofia-sip-ua/nua/check_nua.c
index 60e6b0356c..4ffe3a65bd 100644
--- a/libs/sofia-sip/libsofia-sip-ua/nua/check_nua.c
+++ b/libs/sofia-sip/libsofia-sip-ua/nua/check_nua.c
@@ -112,6 +112,7 @@ int main(int argc, char *argv[])
   check_register_cases(suite);
   check_session_cases(suite);
   check_etsi_cases(suite);
+  check_simple_cases(suite);
 
   runner = srunner_create(suite);