diff --git a/compiler/load/tests/helpers/mod.rs b/compiler/load/tests/helpers/mod.rs
index 22feefb073..b7750b4adb 100644
--- a/compiler/load/tests/helpers/mod.rs
+++ b/compiler/load/tests/helpers/mod.rs
@@ -8,7 +8,7 @@ use roc_can::expected::Expected;
 use roc_can::expr::{canonicalize_expr, Expr, Output};
 use roc_can::operator;
 use roc_can::scope::Scope;
-use roc_collections::all::{ImMap, ImSet, MutMap, SendMap, SendSet};
+use roc_collections::all::{ImMap, ImSet, MutMap, SendSet};
 use roc_constrain::expr::constrain_expr;
 use roc_constrain::module::{constrain_imported_values, Import};
 use roc_module::ident::Ident;
@@ -37,7 +37,7 @@ pub fn infer_expr(
 ) -> (Content, Subs) {
     let env = solve::Env {
         aliases: MutMap::default(),
-        vars_by_symbol: SendMap::default(),
+        vars_by_symbol: MutMap::default(),
     };
     let (solved, _) = solve::run(&env, problems, subs, constraint);
 
diff --git a/compiler/mono/tests/helpers/mod.rs b/compiler/mono/tests/helpers/mod.rs
index cdbcd68ef8..8272bbae95 100644
--- a/compiler/mono/tests/helpers/mod.rs
+++ b/compiler/mono/tests/helpers/mod.rs
@@ -8,7 +8,7 @@ use roc_can::expected::Expected;
 use roc_can::expr::{canonicalize_expr, Expr, Output};
 use roc_can::operator;
 use roc_can::scope::Scope;
-use roc_collections::all::{ImMap, ImSet, MutMap, SendMap, SendSet};
+use roc_collections::all::{ImMap, ImSet, MutMap, SendSet};
 use roc_constrain::expr::constrain_expr;
 use roc_constrain::module::{constrain_imported_values, Import};
 use roc_module::ident::Ident;
@@ -37,7 +37,7 @@ pub fn infer_expr(
 ) -> (Content, Subs) {
     let env = solve::Env {
         aliases: MutMap::default(),
-        vars_by_symbol: SendMap::default(),
+        vars_by_symbol: MutMap::default(),
     };
     let (solved, _) = solve::run(&env, problems, subs, constraint);
 
diff --git a/compiler/reporting/tests/helpers/mod.rs b/compiler/reporting/tests/helpers/mod.rs
index a116b0643e..4d1b7784b7 100644
--- a/compiler/reporting/tests/helpers/mod.rs
+++ b/compiler/reporting/tests/helpers/mod.rs
@@ -7,7 +7,7 @@ use roc_can::expected::Expected;
 use roc_can::expr::{canonicalize_expr, Expr, Output};
 use roc_can::operator;
 use roc_can::scope::Scope;
-use roc_collections::all::{ImMap, MutMap, SendMap, SendSet};
+use roc_collections::all::{ImMap, MutMap, SendSet};
 use roc_constrain::expr::constrain_expr;
 use roc_constrain::module::{constrain_imported_values, Import};
 use roc_module::symbol::{IdentIds, Interns, ModuleId, ModuleIds};
@@ -35,7 +35,7 @@ pub fn infer_expr(
 ) -> (Content, Subs) {
     let env = solve::Env {
         aliases: MutMap::default(),
-        vars_by_symbol: SendMap::default(),
+        vars_by_symbol: MutMap::default(),
     };
     let (solved, _) = solve::run(&env, problems, subs, constraint);
 
diff --git a/compiler/solve/tests/helpers/mod.rs b/compiler/solve/tests/helpers/mod.rs
index dcf196fccb..3fc30dbf6e 100644
--- a/compiler/solve/tests/helpers/mod.rs
+++ b/compiler/solve/tests/helpers/mod.rs
@@ -8,7 +8,7 @@ use roc_can::expected::Expected;
 use roc_can::expr::{canonicalize_expr, Expr, Output};
 use roc_can::operator;
 use roc_can::scope::Scope;
-use roc_collections::all::{ImMap, ImSet, MutMap, SendMap, SendSet};
+use roc_collections::all::{ImMap, ImSet, MutMap, SendSet};
 use roc_constrain::expr::constrain_expr;
 use roc_constrain::module::{constrain_imported_values, Import};
 use roc_module::ident::Ident;
@@ -37,7 +37,7 @@ pub fn infer_expr(
 ) -> (Content, Subs) {
     let env = solve::Env {
         aliases: MutMap::default(),
-        vars_by_symbol: SendMap::default(),
+        vars_by_symbol: MutMap::default(),
     };
     let (solved, _) = solve::run(&env, problems, subs, constraint);
 
diff --git a/compiler/uniq/tests/helpers/mod.rs b/compiler/uniq/tests/helpers/mod.rs
index 9d298728e0..121eaeeee0 100644
--- a/compiler/uniq/tests/helpers/mod.rs
+++ b/compiler/uniq/tests/helpers/mod.rs
@@ -8,7 +8,7 @@ use roc_can::expected::Expected;
 use roc_can::expr::{canonicalize_expr, Expr, Output};
 use roc_can::operator;
 use roc_can::scope::Scope;
-use roc_collections::all::{ImMap, ImSet, MutMap, SendMap, SendSet};
+use roc_collections::all::{ImMap, ImSet, MutMap, SendSet};
 use roc_constrain::expr::constrain_expr;
 use roc_constrain::module::{constrain_imported_values, Import};
 use roc_module::ident::Ident;
@@ -37,7 +37,7 @@ pub fn infer_expr(
 ) -> (Content, Subs) {
     let env = solve::Env {
         aliases: MutMap::default(),
-        vars_by_symbol: SendMap::default(),
+        vars_by_symbol: MutMap::default(),
     };
     let (solved, _) = solve::run(&env, problems, subs, constraint);