diff --git a/README.md b/README.md
index 7e9c506..4950109 100644
--- a/README.md
+++ b/README.md
@@ -63,7 +63,7 @@ These rules forbid:
 1. `new DateTimeImmutable()`
 1. `new DateTime('yesterday')`
 1. `date('Y-m-d')`
-1. `time()`
+1. `time()`, `microtime()`
 1. `strtotime('noon')`
 
 You should instead rely on a clock abstraction like [`lcobucci/clock`](https://github.com/lcobucci/clock).
diff --git a/lib/NotNow/NoTimeRule.php b/lib/NotNow/NoTimeRule.php
index 8f1d3ca..d866ef5 100644
--- a/lib/NotNow/NoTimeRule.php
+++ b/lib/NotNow/NoTimeRule.php
@@ -36,10 +36,16 @@ public function processNode(Node $node, Scope $scope): array
             return [];
         }
 
-        if ('time' !== $this->reflectionProvider->resolveFunctionName($node->name, $scope)) {
+        $functionName = $this->reflectionProvider->resolveFunctionName($node->name, $scope);
+
+        if (! \in_array($functionName, ['time', 'microtime'], true)) {
             return [];
         }
 
-        return [RuleErrorBuilder::message('Calling time() directly is forbidden, rely on a clock abstraction like lcobucci/clock')->identifier('timecall.forbidden')->build()];
+        return [
+            RuleErrorBuilder::message(
+                \sprintf('Calling %s() directly is forbidden, rely on a clock abstraction like lcobucci/clock', $functionName)
+            )
+                ->identifier('timecall.forbidden')->build()];
     }
 }
diff --git a/tests/NotNow/NoTimeRuleTest.php b/tests/NotNow/NoTimeRuleTest.php
index 1bc57f8..41cf77c 100644
--- a/tests/NotNow/NoTimeRuleTest.php
+++ b/tests/NotNow/NoTimeRuleTest.php
@@ -35,6 +35,14 @@ public function testClassConstant(): void
                     'Calling time() directly is forbidden, rely on a clock abstraction like lcobucci/clock',
                     7,
                 ],
+                [
+                    'Calling microtime() directly is forbidden, rely on a clock abstraction like lcobucci/clock',
+                    17,
+                ],
+                [
+                    'Calling microtime() directly is forbidden, rely on a clock abstraction like lcobucci/clock',
+                    18,
+                ],
             ]
         );
     }
diff --git a/tests/NotNow/TestAsset/NoTimeRule/fixture.php b/tests/NotNow/TestAsset/NoTimeRule/fixture.php
index 0c18ce4..5013214 100644
--- a/tests/NotNow/TestAsset/NoTimeRule/fixture.php
+++ b/tests/NotNow/TestAsset/NoTimeRule/fixture.php
@@ -12,3 +12,14 @@
 
 $string = 'time';
 $a5 = $string();
+
+// Not OK
+$a1 = \microtime();
+$a2 = microtime();
+
+// OK
+$a3 = \MyNamespace\microtime();
+$a4 = MySubNamespace\microtime();
+
+$string = 'microtime';
+$a5 = $string();