diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0252882e4..bd4d63ab8 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -14,6 +14,11 @@
 **Note**: Gaps between patch versions are faulty/broken releases. **Note**: A feature tagged as Experimental is in a
 high state of flux, you're at risk of it changing without notice.
 
+# 1.19.2
+
+- **Bug Fix**
+  - fix `Reader.of` definition (@gcanti)
+
 # 1.19.1
 
 - **Bug Fix**
diff --git a/docs/modules/Reader.ts.md b/docs/modules/Reader.ts.md
index d3980a1f4..888b29b06 100644
--- a/docs/modules/Reader.ts.md
+++ b/docs/modules/Reader.ts.md
@@ -104,7 +104,7 @@ export const URI = ...
 **Signature**
 
 ```ts
-export const of: <A>(a: A) => Reader<unknown, A> = ...
+export const of: <R, A>(a: A) => Reader<R, A> = ...
 ```
 
 Added in v1.19.0
diff --git a/package.json b/package.json
index fee7b76fb..8031a9c41 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "fp-ts",
-  "version": "1.19.1",
+  "version": "1.19.2",
   "description": "Functional programming in TypeScript",
   "files": [
     "lib",
diff --git a/src/Reader.ts b/src/Reader.ts
index 98dc0abf5..76b35ccc6 100644
--- a/src/Reader.ts
+++ b/src/Reader.ts
@@ -130,7 +130,7 @@ export const reader: Monad2<URI> & Profunctor2<URI> & Category2<URI> & Strong2<U
 /**
  * @since 1.19.0
  */
-export const of: <A>(a: A) => Reader<unknown, A> = reader.of
+export const of: <R, A>(a: A) => Reader<R, A> = reader.of
 
 const { ap, apFirst, apSecond, chain, chainFirst, compose, flatten, map, promap } = pipeable(reader)