diff --git a/gcore/gdalcachedpixelaccessor.h b/gcore/gdalcachedpixelaccessor.h
index 0d0db7ceda60..6f3f865051b2 100644
--- a/gcore/gdalcachedpixelaccessor.h
+++ b/gcore/gdalcachedpixelaccessor.h
@@ -40,6 +40,9 @@ class GDALCachedPixelAccessor
 
     struct CachedTile
     {
+        // Avoid a GCC 13.1 internal compiler error in C++20 aggregate initialization of the array.
+        CachedTile() = default;
+
         std::vector<Type> m_data{};
         int m_nTileX = -1;
         int m_nTileY = -1;