diff --git a/compiler/builtins/src/std.rs b/compiler/builtins/src/std.rs
index 9d16d8d34c..e4c989c521 100644
--- a/compiler/builtins/src/std.rs
+++ b/compiler/builtins/src/std.rs
@@ -431,8 +431,8 @@ pub fn types() -> MutMap<Symbol, (SolvedType, Region)> {
     );
 
     // log : Float a -> Float a
-    let log_of_negative = SolvedType::TagUnion(
-        vec![(TagName::Global("LogOfNegative".into()), vec![])],
+    let log_needs_positive = SolvedType::TagUnion(
+        vec![(TagName::Global("LogNeedsPositive".into()), vec![])],
         Box::new(SolvedType::Wildcard),
     );
 
@@ -440,7 +440,7 @@ pub fn types() -> MutMap<Symbol, (SolvedType, Region)> {
         Symbol::NUM_LOG,
         top_level_function(
             vec![float_type(flex(TVAR1))],
-            Box::new(result_type(float_type(flex(TVAR1)), log_of_negative)),
+            Box::new(result_type(float_type(flex(TVAR1)), log_needs_positive)),
         ),
     );
 
diff --git a/compiler/can/src/builtins.rs b/compiler/can/src/builtins.rs
index 79c988f0ff..f08123ed95 100644
--- a/compiler/can/src/builtins.rs
+++ b/compiler/can/src/builtins.rs
@@ -1188,7 +1188,7 @@ fn num_sqrt(symbol: Symbol, var_store: &mut VarStore) -> Def {
     )
 }
 
-/// Num.log : Float -> Result Float [ LogOfNegative ]*
+/// Num.log : Float -> Result Float [ LogNeedsPositive ]*
 fn num_log(symbol: Symbol, var_store: &mut VarStore) -> Def {
     let bool_var = var_store.fresh();
     let float_var = var_store.fresh();
@@ -1220,7 +1220,7 @@ fn num_log(symbol: Symbol, var_store: &mut VarStore) -> Def {
         )],
         final_else: Box::new(no_region(tag(
             "Err",
-            vec![tag("LogOfNegative", Vec::new(), var_store)],
+            vec![tag("LogNeedsPositive", Vec::new(), var_store)],
             var_store,
         ))),
     };