diff --git a/src/Composer/DependencyResolver/SolverProblemsException.php b/src/Composer/DependencyResolver/SolverProblemsException.php
index deaec7d24..33a122ad9 100644
--- a/src/Composer/DependencyResolver/SolverProblemsException.php
+++ b/src/Composer/DependencyResolver/SolverProblemsException.php
@@ -119,7 +119,7 @@ class SolverProblemsException extends \RuntimeException
 
         $ignoreExtensionsArguments = implode(" ", array_map(function ($extension) {
             return "--ignore-platform-req=$extension";
-        }, $missingExtensions));
+        }, array_unique($missingExtensions)));
 
         $text = "To enable extensions, verify that they are enabled in your .ini files:\n    - ";
         $text .= implode("\n    - ", $paths);