diff --git a/src/Illuminate/Validation/Concerns/FormatsMessages.php b/src/Illuminate/Validation/Concerns/FormatsMessages.php
index c95cd3a8051c..d0da5c009171 100644
--- a/src/Illuminate/Validation/Concerns/FormatsMessages.php
+++ b/src/Illuminate/Validation/Concerns/FormatsMessages.php
@@ -31,8 +31,12 @@ protected function getMessage($attribute, $rule)
 
         $lowerRule = Str::snake($rule);
 
+        $customKey = "validation.custom.{$attribute}.{$lowerRule}";
+
         $customMessage = $this->getCustomMessageFromTranslator(
-            $customKey = "validation.custom.{$attribute}.{$lowerRule}"
+                in_array($rule, $this->sizeRules)
+                    ? [$customKey.".{$this->getAttributeType($attribute)}", $customKey]
+                    : $customKey
         );
 
         // First we check for a custom defined validation message for the attribute
@@ -118,25 +122,33 @@ protected function getFromLocalArray($attribute, $lowerRule, $source = null)
     /**
      * Get the custom error message from the translator.
      *
-     * @param  string  $key
+     * @param  array|string  $keys
      * @return string
      */
-    protected function getCustomMessageFromTranslator($key)
+    protected function getCustomMessageFromTranslator($keys)
     {
-        if (($message = $this->translator->get($key)) !== $key) {
-            return $message;
-        }
+        foreach (Arr::wrap($keys) as $key) {
+            if (($message = $this->translator->get($key)) !== $key) {
+                return $message;
+            }
 
-        // If an exact match was not found for the key, we will collapse all of these
-        // messages and loop through them and try to find a wildcard match for the
-        // given key. Otherwise, we will simply return the key's value back out.
-        $shortKey = preg_replace(
-            '/^validation\.custom\./', '', $key
-        );
+            // If an exact match was not found for the key, we will collapse all of these
+            // messages and loop through them and try to find a wildcard match for the
+            // given key. Otherwise, we will simply return the key's value back out.
+            $shortKey = preg_replace(
+                '/^validation\.custom\./', '', $key
+            );
+
+            $message = $this->getWildcardCustomMessages(Arr::dot(
+                (array) $this->translator->get('validation.custom')
+            ), $shortKey, $key);
+
+            if ($message !== $key) {
+                return $message;
+            }
+        }
 
-        return $this->getWildcardCustomMessages(Arr::dot(
-            (array) $this->translator->get('validation.custom')
-        ), $shortKey, $key);
+        return Arr::last(Arr::wrap($keys));
     }
 
     /**
diff --git a/tests/Validation/ValidationValidatorTest.php b/tests/Validation/ValidationValidatorTest.php
index a7da88c4fdd6..fff9e6f0f0fb 100755
--- a/tests/Validation/ValidationValidatorTest.php
+++ b/tests/Validation/ValidationValidatorTest.php
@@ -600,6 +600,31 @@ public function testCustomValidationLinesAreRespected()
         $this->assertSame('really required!', $v->messages()->first('name'));
     }
 
+    public function testCustomValidationLinesForSizeRules()
+    {
+        $trans = $this->getIlluminateArrayTranslator();
+        $trans->getLoader()->addMessages('en', 'validation', [
+            'required' => 'required!',
+            'custom' => [
+                'image' => [
+                    'gte' => [
+                        'file' => 'Custom message for image files.',
+                        'string' => 'Custom message for image filenames.',
+                    ],
+                ],
+            ],
+        ]);
+
+        $v = new Validator($trans, ['image' => 'image.png'], ['image' => 'gte:50']);
+        $this->assertFalse($v->passes());
+        $this->assertSame('Custom message for image filenames.', $v->messages()->first('image'));
+
+        $file = new UploadedFile(__FILE__, '', null, null, true);
+        $v = new Validator($trans, ['image' => $file], ['image' => 'gte:50']);
+        $this->assertFalse($v->passes());
+        $this->assertSame('Custom message for image files.', $v->messages()->first('image'));
+    }
+
     public function testCustomValidationLinesAreRespectedWithAsterisks()
     {
         $trans = $this->getIlluminateArrayTranslator();