diff --git a/presets/objects.js b/presets/objects.js
index 2fd04429..dace15bb 100644
--- a/presets/objects.js
+++ b/presets/objects.js
@@ -421,14 +421,14 @@ function makeObjects() {
             "Molecular",
             {
                 hydrogen: {
-                    height: math.unit(1.06e-10, "mm"),
+                    height: math.unit(1.06e-10, "m"),
                     mass: math.unit(1, "dalton"),
                     image: { source: "./media/objects/circle.svg" },
                     name: "Hydrogen atom",
                     rename: true
                 },
                 proton: {
-                    height: math.unit(1e-15, "mm"),
+                    height: math.unit(1e-15, "m"),
                     mass: math.unit(1, "dalton"),
                     image: { source: "./media/objects/circle.svg" },
                     name: "Proton",