diff --git a/src/internal/symbol/observable.ts b/src/internal/symbol/observable.ts
index 974e73b1e8..35e7c27da6 100644
--- a/src/internal/symbol/observable.ts
+++ b/src/internal/symbol/observable.ts
@@ -1,11 +1,2 @@
-/** Symbol.observable addition */
-/* Note: This will add Symbol.observable globally for all TypeScript users,
-  however, we are no longer polyfilling Symbol.observable */
-declare global {
-  interface SymbolConstructor {
-    readonly observable: symbol;
-  }
-}
-
 /** Symbol.observable or a string "@@observable". Used for interop */
 export const observable = (() => (typeof Symbol === 'function' && Symbol.observable) || '@@observable')();
diff --git a/src/internal/types.ts b/src/internal/types.ts
index 944bfc1d45..8b94b4f748 100644
--- a/src/internal/types.ts
+++ b/src/internal/types.ts
@@ -4,6 +4,16 @@
 import { Observable } from './Observable';
 import { Subscription } from './Subscription';
 
+/**
+ * Note: This will add Symbol.observable globally for all TypeScript users,
+ * however, we are no longer polyfilling Symbol.observable
+ */
+declare global {
+  interface SymbolConstructor {
+    readonly observable: symbol;
+  }
+}
+
 /** OPERATOR INTERFACES */
 
 export interface UnaryFunction<T, R> {