diff --git a/packages/decap-cms-lib-widgets/src/stringTemplate.ts b/packages/decap-cms-lib-widgets/src/stringTemplate.ts
index 1675756f1db0..7c49f2a4fff7 100644
--- a/packages/decap-cms-lib-widgets/src/stringTemplate.ts
+++ b/packages/decap-cms-lib-widgets/src/stringTemplate.ts
@@ -175,6 +175,8 @@ export function compileStringTemplate(
     RegExp(templateVariablePattern, 'g'),
     (_full, key: string, _part, filter: string) => {
       let replacement;
+      key = key.trim();
+      filter = filter.trim();
       const explicitFieldReplacement = getExplicitFieldReplacement(key, data);
 
       if (explicitFieldReplacement) {