diff --git a/src/services/search/services/parse.js b/src/services/search/services/parse.js
index d6961d618..80847a6a2 100644
--- a/src/services/search/services/parse.js
+++ b/src/services/search/services/parse.js
@@ -41,7 +41,7 @@ function getFulltext(tokens, searchContext) {
 }
 
 function isOperator(str) {
-    return str.match(/^[=<>*]+$/);
+    return str.match(/^[!=<>*]+$/);
 }
 
 function getExpression(tokens, searchContext, level = 0) {