diff --git a/src/test/func/malloc/malloc.cc b/src/test/func/malloc/malloc.cc
index 8974e3a..b3dd268 100644
--- a/src/test/func/malloc/malloc.cc
+++ b/src/test/func/malloc/malloc.cc
@@ -48,8 +48,11 @@ void test_realloc(void* p, size_t size, int err, bool null)
 {
   fprintf(stderr, "realloc(%p(%d), %d)\n", p, int(size), (int)size);
   errno = 0;
-  p = our_realloc(p, size);
-  check_result(size, 1, p, err, null);
+  auto new_p = our_realloc(p, size);
+  // Realloc failure case, deallocate original block
+  if (new_p == nullptr && size != 0)
+    our_free(p);
+  check_result(size, 1, new_p, err, null);
 }
 
 void test_posix_memalign(size_t size, size_t align, int err, bool null)