diff --git a/ts/dist/multisource.js b/ts/dist/multisource.js
index 7a2340c..a8790ad 100644
--- a/ts/dist/multisource.js
+++ b/ts/dist/multisource.js
@@ -121,7 +121,21 @@ const MultiSource = (jsonic, popts) => {
                         src: fullpath,
                         wen: Date.now(),
                     };
-                    depmap[parent] = depmap[parent] || {};
+                    // `parent` is a SOURCE PATH, so it is only as trustworthy as the
+                    // tree being resolved. On an ordinary object `depmap['__proto__']`
+                    // answers with `Object.prototype` — truthy, so the `||` never fires
+                    // and the dependency is recorded onto the prototype of every object
+                    // in the process. `defineProperty` creates an own property instead
+                    // of invoking the `__proto__` setter, and the own-property read
+                    // stops an inherited name masquerading as an existing entry.
+                    if (!Object.prototype.hasOwnProperty.call(depmap, parent)) {
+                        Object.defineProperty(depmap, parent, {
+                            value: Object.create(null),
+                            writable: true,
+                            enumerable: true,
+                            configurable: true,
+                        });
+                    }
                     depmap[parent][fullpath] = dep;
                 }
             }
diff --git a/ts/dist/multisource.js.map b/ts/dist/multisource.js.map
index fa540a0..cde997f 100644
--- a/ts/dist/multisource.js.map
+++ b/ts/dist/multisource.js.map
@@ -1 +1 @@
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\ No newline at end of file
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\ No newline at end of file
diff --git a/ts/src/multisource.ts b/ts/src/multisource.ts
index d640b99..97026e8 100644
--- a/ts/src/multisource.ts
+++ b/ts/src/multisource.ts
@@ -178,7 +178,21 @@ const MultiSource: Plugin = (jsonic: Jsonic, popts: MultiSourceOptions) => {
             src: fullpath,
             wen: Date.now(),
           }
-          depmap[parent] = depmap[parent] || {}
+          // `parent` is a SOURCE PATH, so it is only as trustworthy as the
+          // tree being resolved. On an ordinary object `depmap['__proto__']`
+          // answers with `Object.prototype` — truthy, so the `||` never fires
+          // and the dependency is recorded onto the prototype of every object
+          // in the process. `defineProperty` creates an own property instead
+          // of invoking the `__proto__` setter, and the own-property read
+          // stops an inherited name masquerading as an existing entry.
+          if (!Object.prototype.hasOwnProperty.call(depmap, parent)) {
+            Object.defineProperty(depmap, parent, {
+              value: Object.create(null),
+              writable: true,
+              enumerable: true,
+              configurable: true,
+            })
+          }
           depmap[parent][fullpath] = dep
         }
       }