diff --git a/src/propeller/tools/math.cljc b/src/propeller/tools/math.cljc
index 6102316..d3be7ca 100644
--- a/src/propeller/tools/math.cljc
+++ b/src/propeller/tools/math.cljc
@@ -5,7 +5,7 @@
                :cljs js/Math.PI))
 
 (defonce ^{:no-doc true :const true} E #?(:clj  Math/E
-              :cljs js/Math.PI))
+              :cljs js/Math.E))
 
 (defn step
   "returns 1 if number is nonzero, 0 otherwise"
@@ -141,4 +141,4 @@
 (defn transpose
   "returns a vector containing the transpose of a coll of colls"
   [x]
-  (apply map vector x))
\ No newline at end of file
+  (apply map vector x))