diff --git a/spec/Prophecy/Prophecy/ObjectProphecySpec.php b/spec/Prophecy/Prophecy/ObjectProphecySpec.php
index c6afb3ef0..062ebd574 100644
--- a/spec/Prophecy/Prophecy/ObjectProphecySpec.php
+++ b/spec/Prophecy/Prophecy/ObjectProphecySpec.php
@@ -125,7 +125,7 @@ function its_addMethodProphecy_adds_method_prophecy(
         $this->addMethodProphecy($methodProphecy);
 
         $this->getMethodProphecies()->shouldReturn(array(
-            'getUsername' => array($methodProphecy)
+            'getusername' => array($methodProphecy)
         ));
     }
 
@@ -145,7 +145,30 @@ function its_addMethodProphecy_handles_prophecies_with_different_arguments(
         $this->addMethodProphecy($methodProphecy2);
 
         $this->getMethodProphecies()->shouldReturn(array(
-            'getUsername' => array(
+            'getusername' => array(
+                $methodProphecy1,
+                $methodProphecy2,
+            )
+        ));
+    }
+
+    function its_addMethodProphecy_handles_prophecies_for_caseinsensitive_method_names(
+        MethodProphecy $methodProphecy1,
+        MethodProphecy $methodProphecy2,
+        ArgumentsWildcard $argumentsWildcard1,
+        ArgumentsWildcard $argumentsWildcard2
+    ) {
+        $methodProphecy1->getArgumentsWildcard()->willReturn($argumentsWildcard1);
+        $methodProphecy1->getMethodName()->willReturn('getUsername');
+
+        $methodProphecy2->getArgumentsWildcard()->willReturn($argumentsWildcard2);
+        $methodProphecy2->getMethodName()->willReturn('getUserName');
+
+        $this->addMethodProphecy($methodProphecy1);
+        $this->addMethodProphecy($methodProphecy2);
+
+        $this->getMethodProphecies()->shouldReturn(array(
+            'getusername' => array(
                 $methodProphecy1,
                 $methodProphecy2,
             )
@@ -168,10 +191,10 @@ function its_addMethodProphecy_handles_prophecies_for_different_methods(
         $this->addMethodProphecy($methodProphecy2);
 
         $this->getMethodProphecies()->shouldReturn(array(
-            'getUsername' => array(
+            'getusername' => array(
                 $methodProphecy1
             ),
-            'isUsername' => array(
+            'isusername' => array(
                 $methodProphecy2
             )
         ));
diff --git a/src/Prophecy/Call/CallCenter.php b/src/Prophecy/Call/CallCenter.php
index 92a651450..9a741765a 100644
--- a/src/Prophecy/Call/CallCenter.php
+++ b/src/Prophecy/Call/CallCenter.php
@@ -138,11 +138,11 @@ public function makeCall(ObjectProphecy $prophecy, $methodName, array $arguments
      */
     public function findCalls($methodName, ArgumentsWildcard $wildcard)
     {
-        $lowerMethodName = strtolower($methodName);
+        $methodName = strtolower($methodName);
 
         return array_values(
-            array_filter($this->recordedCalls, function (Call $call) use ($lowerMethodName, $wildcard) {
-                return $lowerMethodName === strtolower($call->getMethodName())
+            array_filter($this->recordedCalls, function (Call $call) use ($methodName, $wildcard) {
+                return $methodName === strtolower($call->getMethodName())
                     && 0 < $call->getScore($wildcard)
                 ;
             })
diff --git a/src/Prophecy/Prophecy/ObjectProphecy.php b/src/Prophecy/Prophecy/ObjectProphecy.php
index de1a31ddb..ecc22bf55 100644
--- a/src/Prophecy/Prophecy/ObjectProphecy.php
+++ b/src/Prophecy/Prophecy/ObjectProphecy.php
@@ -146,7 +146,7 @@ public function addMethodProphecy(MethodProphecy $methodProphecy)
             ), $methodProphecy);
         }
 
-        $methodName = $methodProphecy->getMethodName();
+        $methodName = strtolower($methodProphecy->getMethodName());
 
         if (!isset($this->methodProphecies[$methodName])) {
             $this->methodProphecies[$methodName] = array();
@@ -168,18 +168,13 @@ public function getMethodProphecies($methodName = null)
             return $this->methodProphecies;
         }
 
-        $lowerMethodName = strtolower($methodName);
+        $methodName = strtolower($methodName);
 
-        $result = array();
-        foreach ($this->methodProphecies as $name => $prophecies) {
-            if (strtolower($name) === $lowerMethodName) {
-                foreach ($prophecies as $prophecy) {
-                    $result[] = $prophecy;
-                }
-            }
+        if (!isset($this->methodProphecies[$methodName])) {
+            return array();
         }
 
-        return $result;
+        return $this->methodProphecies[$methodName];
     }
 
     /**