diff --git a/src/gui/debugWindow.cpp b/src/gui/debugWindow.cpp
index ce4d6515b..fdaf3b066 100644
--- a/src/gui/debugWindow.cpp
+++ b/src/gui/debugWindow.cpp
@@ -636,6 +636,7 @@ void FurnaceGUI::drawDebug() {
           rend->updateTexture(t,data,2048*4);
           rend->destroyTexture(t);
         }
+        delete[] data;
       }
       if (ImGui::Button("Write (lock)")) {
         unsigned char* data=NULL;