diff --git a/src/civic/index.js b/src/civic/index.js
index cce353a..2615104 100644
--- a/src/civic/index.js
+++ b/src/civic/index.js
@@ -229,7 +229,7 @@ const processEvidenceRecord = async (opt) => {
         // TODO: Deal with __typename === 'Factor'
         // No actual case as April 22nd, 2024
         throw new NotImplementedError(
-            `unable to process variant's feature of type Factor`,
+            'unable to process variant\'s feature of type Factor',
         );
     }
 
diff --git a/src/civic/variant.js b/src/civic/variant.js
index a237ac9..5550069 100644
--- a/src/civic/variant.js
+++ b/src/civic/variant.js
@@ -341,7 +341,7 @@ const processVariantRecord = async (conn, civicVariantRecord, feature) => {
         // TODO: Deal with __typename === 'Factor'
         // No actual case as April 22nd, 2024
         throw new NotImplementedError(
-            `unable to process variant's feature of type Factor`,
+            'unable to process variant\'s feature of type Factor',
         );
     }