diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8a6e49f6..c4bedd12 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -22,7 +22,7 @@ All notable changes to this project will be documented in this file, in reverse
 
 ### Fixed
 
-- Nothing.
+- [#90](https://github.com/webimpress/coding-standard/pull/90) fixes false-positive in `Formatting\RedundantParentheses` sniff when using nested ternary with `instanceof` condition.
 
 ## 1.1.3 - 2020-02-09
 
diff --git a/src/WebimpressCodingStandard/Sniffs/Formatting/RedundantParenthesesSniff.php b/src/WebimpressCodingStandard/Sniffs/Formatting/RedundantParenthesesSniff.php
index 626aa65b..08fc6ffd 100644
--- a/src/WebimpressCodingStandard/Sniffs/Formatting/RedundantParenthesesSniff.php
+++ b/src/WebimpressCodingStandard/Sniffs/Formatting/RedundantParenthesesSniff.php
@@ -152,7 +152,11 @@ public function process(File $phpcsFile, $stackPtr)
         if (! in_array($tokens[$prev]['code'], Tokens::$castTokens, true)) {
             $instanceOf = $phpcsFile->findNext(T_INSTANCEOF, $stackPtr + 1, $closePtr);
             if ($instanceOf !== false) {
-                $op = $phpcsFile->findNext(Tokens::$booleanOperators, $stackPtr + 1, $closePtr);
+                $op = $phpcsFile->findNext(
+                    Tokens::$booleanOperators + [T_INLINE_ELSE => T_INLINE_ELSE],
+                    $stackPtr + 1,
+                    $closePtr
+                );
                 if ($op === false) {
                     $this->error($phpcsFile, $stackPtr, $closePtr, 'SingleInstanceOf');
                     return;
diff --git a/test/Sniffs/Formatting/RedundantParenthesesUnitTest.inc b/test/Sniffs/Formatting/RedundantParenthesesUnitTest.inc
index 671ec928..72e338dd 100644
--- a/test/Sniffs/Formatting/RedundantParenthesesUnitTest.inc
+++ b/test/Sniffs/Formatting/RedundantParenthesesUnitTest.inc
@@ -192,4 +192,11 @@ class RedundantParentheses
         if (! (new Invoke())()) {}
         if (! (new Invoke())->method()) {}
     }
+
+    public function nestedTernary()
+    {
+        return $a->foo()
+            ? $a->bar()
+            : ($a->baz() instanceof \DateTime ? 1 : 2);
+    }
 }
diff --git a/test/Sniffs/Formatting/RedundantParenthesesUnitTest.inc.fixed b/test/Sniffs/Formatting/RedundantParenthesesUnitTest.inc.fixed
index be7db75b..c3c978fa 100644
--- a/test/Sniffs/Formatting/RedundantParenthesesUnitTest.inc.fixed
+++ b/test/Sniffs/Formatting/RedundantParenthesesUnitTest.inc.fixed
@@ -192,4 +192,11 @@ class RedundantParentheses
         if (! (new Invoke())()) {}
         if (! (new Invoke())->method()) {}
     }
+
+    public function nestedTernary()
+    {
+        return $a->foo()
+            ? $a->bar()
+            : ($a->baz() instanceof \DateTime ? 1 : 2);
+    }
 }