diff --git a/README.md b/README.md
index 03f9d4e..4403b01 100644
--- a/README.md
+++ b/README.md
@@ -40,7 +40,7 @@ In `net.cgrand.xforms.io`:
 Add this dependency to your project:
 
 ```clj
-[net.cgrand/xforms "0.18.1"]
+[net.cgrand/xforms "0.18.2"]
 ```
 
 ```clj
diff --git a/project.clj b/project.clj
index 66ed108..4baac99 100644
--- a/project.clj
+++ b/project.clj
@@ -1,4 +1,4 @@
-(defproject net.cgrand/xforms "0.18.1"
+(defproject net.cgrand/xforms "0.18.2"
   :description "Extra transducers for Clojure"
   :url "https://github.com/cgrand/xforms"
   :license {:name "Eclipse Public License"
diff --git a/src/net/cgrand/xforms/rfs.cljc b/src/net/cgrand/xforms/rfs.cljc
index 7635912..9db799c 100644
--- a/src/net/cgrand/xforms/rfs.cljc
+++ b/src/net/cgrand/xforms/rfs.cljc
@@ -29,7 +29,14 @@
   
 (defn minimum
  ([comparator]
-   (minimum comparator nil))
+   (fn
+     ([] nil)
+     ([x] x)
+     ([a b] (cond
+              (nil? a) b
+              (nil? b) a
+              (pos? (#?(:clj .compare :cljs cmp) comparator a b)) b
+              :else a))))
  ([#?(:clj ^java.util.Comparator comparator :cljs comparator) absolute-maximum]
    (fn
      ([] ::+∞)
@@ -40,7 +47,14 @@
 
 (defn maximum
   ([comparator]
-    (maximum comparator nil))
+    (fn
+     ([] nil)
+     ([x] x)
+     ([a b] (cond
+              (nil? a) b
+              (nil? b) a
+              (neg? (#?(:clj .compare :cljs cmp) comparator a b)) b
+              :else a))))
   ([#?(:clj ^java.util.Comparator comparator :cljs comparator) absolute-minimum]
     (fn
       ([] ::-∞)