diff --git a/CHANGELOG.md b/CHANGELOG.md
index fed5257d..7f9ef41a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,10 @@
 
 ## v1.0.29-alpha - UNRELEASED
 
+### Added
+
+- **aiken-lang**: new LSP quickfix for 'use let' warning. @KtorZ
+
 ### Changed
 
 - **aiken-lang**: the keyword `fail` on property-based test semantic has changed and now consider a test to succeed only if **every** execution of the test failed (instead of just one). The previous behavior can be recovered by adding the keyword `once` after `fail`. @KtorZ
diff --git a/crates/aiken-lsp/src/quickfix.rs b/crates/aiken-lsp/src/quickfix.rs
index 06486bf2..1f98ba07 100644
--- a/crates/aiken-lsp/src/quickfix.rs
+++ b/crates/aiken-lsp/src/quickfix.rs
@@ -10,6 +10,7 @@ const UNKNOWN_CONSTRUCTOR: &str = "aiken::check::unknown::type_constructor";
 const UNKNOWN_MODULE: &str = "aiken::check::unknown::module";
 const UNUSED_IMPORT_VALUE: &str = "aiken::check::unused:import::value";
 const UNUSED_IMPORT_MODULE: &str = "aiken::check::unused::import::module";
+const USE_LET: &str = "aiken::check::single_constructor_expect";
 const UTF8_BYTE_ARRAY_IS_VALID_HEX_STRING: &str =
     "aiken::check::syntax::bytearray_literal_is_hex_string";
 
@@ -21,6 +22,7 @@ pub enum Quickfix {
     UnknownConstructor(lsp_types::Diagnostic),
     UnusedImports(Vec<lsp_types::Diagnostic>),
     Utf8ByteArrayIsValidHexString(lsp_types::Diagnostic),
+    UseLet(lsp_types::Diagnostic),
 }
 
 fn match_code(
@@ -65,6 +67,10 @@ pub fn assert(diagnostic: lsp_types::Diagnostic) -> Option<Quickfix> {
         return Some(Quickfix::Utf8ByteArrayIsValidHexString(diagnostic));
     }
 
+    if match_code(&diagnostic, Severity::WARNING, USE_LET) {
+        return Some(Quickfix::UseLet(diagnostic));
+    }
+
     None
 }
 
@@ -116,6 +122,12 @@ pub fn quickfix(
                 diagnostic,
                 utf8_byte_array_is_hex_string(diagnostic),
             ),
+            Quickfix::UseLet(diagnostic) => each_as_distinct_action(
+                &mut actions,
+                text_document,
+                diagnostic,
+                use_let(diagnostic),
+            ),
         };
     }
 
@@ -285,3 +297,13 @@ fn utf8_byte_array_is_hex_string(diagnostic: &lsp_types::Diagnostic) -> Vec<Anno
 
     edits
 }
+
+fn use_let(diagnostic: &lsp_types::Diagnostic) -> Vec<AnnotatedEdit> {
+    vec![(
+        "Use 'let' instead of 'expect'".to_string(),
+        lsp_types::TextEdit {
+            range: diagnostic.range,
+            new_text: "let".to_string(),
+        },
+    )]
+}