diff --git a/assets/resources/scriptlets.js b/assets/resources/scriptlets.js
index ce9297f15..e75da6e66 100644
--- a/assets/resources/scriptlets.js
+++ b/assets/resources/scriptlets.js
@@ -582,8 +582,8 @@
 })();
 
 
-/// setInterval-if.js
-/// alias siif.js
+/// no-setInterval-if.js
+/// alias nosiif.js
 (function() {
     let needle = '{{1}}';
     const needleNot = needle.charAt(0) === '!';
@@ -611,14 +611,12 @@
             let defuse = false;
             if ( log !== undefined ) {
                 log('uBO: setInterval("%s", %s)', a, b);
-            } else if ( needle === '' && needleNot || isNaN(delay) && delayNot ) {
-                defuse = true;
             } else if ( isNaN(delay) ) {
-                defuse = reNeedle.test(a) === needleNot;
+                defuse = reNeedle.test(a) !== needleNot;
             } else if ( needle === '' ) {
-                defuse = (b === delay) === delayNot;
-            } else if ( reNeedle.test(a) === needleNot || (b === delay) === delayNot ) {
-                defuse = true;
+                defuse = (b === delay) !== delayNot;
+            } else {
+                defuse = reNeedle.test(a) !== needleNot && (b === delay) !== delayNot;
             }
             if ( defuse ) {
                 args[0] = function(){};
@@ -655,8 +653,8 @@
 })();
 
 
-/// setTimeout-if.js
-/// alias stif.js
+/// no-setTimeout-if.js
+/// alias nostif.js
 (function() {
     let needle = '{{1}}';
     const needleNot = needle.charAt(0) === '!';
@@ -684,14 +682,12 @@
             let defuse = false;
             if ( log !== undefined ) {
                 log('uBO: setTimeout("%s", %s)', a, b);
-            } else if ( needle === '' && needleNot || isNaN(delay) && delayNot ) {
-                defuse = true;
             } else if ( isNaN(delay) ) {
-                defuse = reNeedle.test(a) === needleNot;
+                defuse = reNeedle.test(a) !== needleNot;
             } else if ( needle === '' ) {
-                defuse = (b === delay) === delayNot;
-            } else if ( reNeedle.test(a) === needleNot || (b === delay) === delayNot ) {
-                defuse = true;
+                defuse = (b === delay) !== delayNot;
+            } else {
+                defuse = reNeedle.test(a) !== needleNot && (b === delay) !== delayNot;
             }
             if ( defuse ) {
                 args[0] = function(){};
diff --git a/docs/tests/scriptlet-injection-filters-1.html b/docs/tests/scriptlet-injection-filters-1.html
index f7e32b751..704d1323b 100644
--- a/docs/tests/scriptlet-injection-filters-1.html
+++ b/docs/tests/scriptlet-injection-filters-1.html
@@ -162,21 +162,21 @@ time. When you try a filter, ensure the result is what is expected.</p>
     const hostname = self.location.hostname;
     const fragment = document.createDocumentFragment();
     const filters = [
-        [ [ '!bad' ], 'GGGG' ],
-        [ [ 'good' ], 'GGGG' ],
-        [ [ '', '!33' ], 'GRRG' ],
-        [ [ '', '66' ], 'GRRG' ],
-        [ [ '!bad', '!33' ], 'GGRG' ],
-        [ [ 'good', '66' ], 'GGRG' ],
-        [ [ '!bad', '33' ], 'GGGR' ],
-        [ [ 'good', '!66' ], 'GGGR' ],
-        [ [ 'bad', '!33' ], 'GRRR' ],
-        [ [ '!good', '66' ], 'GRRR' ],
+        [ [ 'bad' ], 'GGGG' ],
+        [ [ '!good' ], 'GGGG' ],
+        [ [ '', '33' ], 'GRRG' ],
+        [ [ '', '!66' ], 'GRRG' ],
+        [ [ 'bad', '33' ], 'GRGG' ],
+        [ [ '!good', '!66' ], 'GRGG' ],
+        [ [ 'bad', '!33' ], 'RGGG' ],
+        [ [ '!good', '66' ], 'RGGG' ],
+        [ [ '!bad', '33' ], 'RRRG' ],
+        [ [ 'good', '!66' ], 'RRRG' ],
     ];
     for ( const [ args, result ] of filters ) {
         const tr = document.createElement('tr');
         let td = document.createElement('td');
-        td.textContent = `${hostname}##+js(stif, ${args.join(', ')})`;
+        td.textContent = `${hostname}##+js(nostif, ${args.join(', ')})`;
         tr.appendChild(td);
         td = document.createElement('td');
         for ( let i = 0; i < result.length; i++ ) {