diff --git a/libs/core/images.cpp b/libs/core/images.cpp
index 63a4b924..4178122e 100644
--- a/libs/core/images.cpp
+++ b/libs/core/images.cpp
@@ -40,7 +40,7 @@ namespace images {
 //% blockId=device_build_image block="create image"
 //% parts="ledmatrix"
 Image createImage(ImageLiteral_ leds) {
-    return new RefMImage(imageBytes(leds));
+    return NEW_GC(RefMImage, imageBytes(leds));
 }
 
 /**
diff --git a/libs/core/led.cpp b/libs/core/led.cpp
index 88ce3e13..5eeffe75 100644
--- a/libs/core/led.cpp
+++ b/libs/core/led.cpp
@@ -145,7 +145,7 @@ namespace led {
     //% parts="ledmatrix"
     Image screenshot() {
         auto d = uBit.display.screenShot().leakData();
-        auto r = new RefMImage(d);
+        auto r = NEW_GC(RefMImage, d);
         d->decr();
         return r;
         /*