diff --git a/tests/Makefile b/tests/Makefile
index 62a80d85..ddb3dfcd 100644
--- a/tests/Makefile
+++ b/tests/Makefile
@@ -91,7 +91,7 @@ fail-generic.log:
 fail-no-oplist.log:
 	@$(MAKE) fail-generic.log FAIL_BASE=fail-no-oplist FAIL_SEQ=44
 fail-chain-oplist.log:
-	@$(MAKE) fail-generic.log FAIL_BASE=fail-chain-oplist FAIL_SEQ=23
+	@$(MAKE) fail-generic.log FAIL_BASE=fail-chain-oplist FAIL_SEQ=24
 fail-incompatible.log:
 	@$(MAKE) fail-generic.log FAIL_BASE=fail-incompatible FAIL_SEQ=24
 
@@ -122,7 +122,6 @@ gene-string:
 	$(CC) $(CFLAGS) $(CPPFLAGS) -O3 -march=native -DNDEBUG -S tgen-mstring.c && less tgen-mstring.s
 
 
-#####################################################################################################
 # Coverage
 #####################################################################################################
 
diff --git a/tests/fail-chain-oplist.c b/tests/fail-chain-oplist.c
index 6334ad59..78929c93 100644
--- a/tests/fail-chain-oplist.c
+++ b/tests/fail-chain-oplist.c
@@ -221,6 +221,15 @@ int f(void) {
   return r;
 }
 
+#elif TEST == 24
+
+#include "m-tuple.h"
+#include "m-string.h"
+
+//TUPLE_DEF2(aggregate, (x, int), (z, string_t))
+#define M_OPL_aggregate_t() TUPLE_OPLIST(aggregate, int, string_t)
+TUPLE_DEF2(struct2, (a, aggregate_t))
+
 #else
 # warning TEST variable is out of range.
 #endif