diff --git a/unit/atf-src/atf-c/detail/tp_main.c b/unit/atf-src/atf-c/detail/tp_main.c
index 1f1222de86..2c773117f7 100644
--- a/unit/atf-src/atf-c/detail/tp_main.c
+++ b/unit/atf-src/atf-c/detail/tp_main.c
@@ -285,7 +285,9 @@ list_tcs(const atf_tp_t *tp)
 
         atf_utils_free_charpp(vars);
     }
-    free(tcs);
+#define UNCONST(a) ((void *)(unsigned long)(const void *)(a))
+    free(UNCONST(tcs));
+#undef UNCONST
 }
 
 /* ---------------------------------------------------------------------