diff --git a/packages/squiggle-lang/__tests__/JS__Test.ts b/packages/squiggle-lang/__tests__/JS__Test.ts
index 9ede97ef..641b0b5d 100644
--- a/packages/squiggle-lang/__tests__/JS__Test.ts
+++ b/packages/squiggle-lang/__tests__/JS__Test.ts
@@ -8,4 +8,8 @@ describe("A simple result", () => {
         let foo = run("normal(5,2)");
         expect(1).toEqual(1);
     });
+    test("log(1) = 0", () => {
+      let foo = run("log(1)");
+      expect(foo).toEqual({ tag: 'Ok', value: { hd: { NAME: 'Float', VAL: 0}, tl: 0}});
+    })
 });
diff --git a/packages/squiggle-lang/src/rescript/interpreter/typeSystem/HardcodedFunctions.res b/packages/squiggle-lang/src/rescript/interpreter/typeSystem/HardcodedFunctions.res
index 3e06ae71..9178d6c2 100644
--- a/packages/squiggle-lang/src/rescript/interpreter/typeSystem/HardcodedFunctions.res
+++ b/packages/squiggle-lang/src/rescript/interpreter/typeSystem/HardcodedFunctions.res
@@ -186,6 +186,17 @@ let all = [
       },
     (),
   ),
+  Function.T.make(
+    ~name="log",
+    ~outputType=#Float,
+    ~inputTypes=[#Float],
+    ~run=x =>
+      switch x {
+      | [#Float(a)] => Ok(#SymbolicDist(#Float(Js.Math.log(a))))
+      | e => wrongInputsError(e)
+      },
+    (),
+  ),
   makeDistFloat("pdf", (dist, float) => floatFromDist(#Pdf(float), dist)),
   makeDistFloat("inv", (dist, float) => floatFromDist(#Inv(float), dist)),
   makeDistFloat("cdf", (dist, float) => floatFromDist(#Cdf(float), dist)),