1 files changed, 6 insertions, 1 deletions
diff --git a/libtests/sparse_array.cc b/libtests/sparse_array.cc
index 9c3e00b4..5636abd1 100644
--- a/libtests/sparse_array.cc
+++ b/libtests/sparse_array.cc
@@ -1,7 +1,12 @@
 #include <qpdf/SparseOHArray.hh>
-#include <assert.h>
 #include <iostream>
 
+#ifdef NDEBUG
+// We need assert even in a release build for test code.
+# undef NDEBUG
+#endif
+#include <cassert>
+
 int main()
 {
     SparseOHArray a;