diff --git a/regressions/ck_stack/validate/pair.c b/regressions/ck_stack/validate/pair.c
index 261e169..8261070 100644
--- a/regressions/ck_stack/validate/pair.c
+++ b/regressions/ck_stack/validate/pair.c
@@ -172,7 +172,7 @@ main(int argc, char *argv[])
 	pthread_t *thread;
 	struct timeval stv, etv;
 
-#if defined(MPMC) && (!defined(CK_F_STACK_PUSH_MPMC) || !defined(CK_F_STACK_POP_MPMC))
+#if (defined(TRYMPMC) || defined(MPMC)) && (!defined(CK_F_STACK_PUSH_MPMC) || !defined(CK_F_STACK_POP_MPMC))
         fprintf(stderr, "Unsupported.\n");
         return 0;
 #endif
diff --git a/regressions/ck_stack/validate/pop.c b/regressions/ck_stack/validate/pop.c
index 27d65ad..0b5af13 100644
--- a/regressions/ck_stack/validate/pop.c
+++ b/regressions/ck_stack/validate/pop.c
@@ -192,7 +192,7 @@ main(int argc, char *argv[])
 	pthread_t *thread;
 	struct timeval stv, etv;
 
-#if defined(MPMC) && (!defined(CK_F_STACK_PUSH_MPMC) || !defined(CK_F_STACK_POP_MPMC))
+#if (defined(TRYMPMC) || defined(MPMC)) && (!defined(CK_F_STACK_PUSH_MPMC) || !defined(CK_F_STACK_POP_MPMC))
 	fprintf(stderr, "Unsupported.\n");
 	return 0;
 #endif