diff --git a/packages/bruno-app/src/components/RequestPane/Assertions/AssertionRow/index.js b/packages/bruno-app/src/components/RequestPane/Assertions/AssertionRow/index.js
index 953db9e8..8c9b2a83 100644
--- a/packages/bruno-app/src/components/RequestPane/Assertions/AssertionRow/index.js
+++ b/packages/bruno-app/src/components/RequestPane/Assertions/AssertionRow/index.js
@@ -166,7 +166,7 @@ const AssertionRow = ({
             handleAssertionChange(
               {
                 target: {
-                  value: `${op} ${value}`
+                  value: isUnaryOperator(op) ? op : `${op} ${value}`
                 }
               },
               assertion,
@@ -182,7 +182,7 @@ const AssertionRow = ({
             theme={storedTheme}
             readOnly={true}
             onSave={onSave}
-            onChange={(newValue) =>
+            onChange={(newValue) => {
               handleAssertionChange(
                 {
                   target: {
@@ -192,6 +192,7 @@ const AssertionRow = ({
                 assertion,
                 'value'
               )
+              }
             }
             onRun={handleRun}
             collection={collection}