diff --git a/src/utils/queryParser.ts b/src/utils/queryParser.ts
index a07685d..27194db 100644
--- a/src/utils/queryParser.ts
+++ b/src/utils/queryParser.ts
@@ -42,7 +42,7 @@ function formulaToMongoFilter(formula: string): MongoFilter {
       return { [trimmedField]: { $in: parsedValues } };
     }
     // If not equals operator, use $nin
-    else if (operator === "!=") {
+    else if (operator === "!") {
       return { [trimmedField]: { $nin: parsedValues } };
     }
     // Other operators don't make sense with arrays