diff --git a/homeassistant/core.py b/homeassistant/core.py
index 2a40d604ee0..37d1134ef29 100644
--- a/homeassistant/core.py
+++ b/homeassistant/core.py
@@ -1098,9 +1098,11 @@ class ServiceRegistry:
             raise ServiceNotFound(domain, service) from None
 
         if handler.schema:
-            service_data = handler.schema(service_data)
+            processed_data = handler.schema(service_data)
+        else:
+            processed_data = service_data
 
-        service_call = ServiceCall(domain, service, service_data, context)
+        service_call = ServiceCall(domain, service, processed_data, context)
 
         self._hass.bus.async_fire(EVENT_CALL_SERVICE, {
             ATTR_DOMAIN: domain.lower(),
diff --git a/tests/test_core.py b/tests/test_core.py
index 724233cbf98..5ee9f5cdb05 100644
--- a/tests/test_core.py
+++ b/tests/test_core.py
@@ -8,6 +8,7 @@ from unittest.mock import patch, MagicMock
 from datetime import datetime, timedelta
 from tempfile import TemporaryDirectory
 
+import voluptuous as vol
 import pytz
 import pytest
 
@@ -21,7 +22,7 @@ from homeassistant.const import (
     __version__, EVENT_STATE_CHANGED, ATTR_FRIENDLY_NAME, CONF_UNIT_SYSTEM,
     ATTR_NOW, EVENT_TIME_CHANGED, EVENT_TIMER_OUT_OF_SYNC, ATTR_SECONDS,
     EVENT_HOMEASSISTANT_STOP, EVENT_HOMEASSISTANT_CLOSE,
-    EVENT_SERVICE_REGISTERED, EVENT_SERVICE_REMOVED)
+    EVENT_SERVICE_REGISTERED, EVENT_SERVICE_REMOVED, EVENT_CALL_SERVICE)
 
 from tests.common import get_test_home_assistant, async_mock_service
 
@@ -1000,3 +1001,27 @@ async def test_service_executed_with_subservices(hass):
     assert len(calls) == 4
     assert [call.service for call in calls] == [
         'outer', 'inner', 'inner', 'outer']
+
+
+async def test_service_call_event_contains_original_data(hass):
+    """Test that service call event contains original data."""
+    events = []
+
+    @ha.callback
+    def callback(event):
+        events.append(event)
+
+    hass.bus.async_listen(EVENT_CALL_SERVICE, callback)
+
+    calls = async_mock_service(hass, 'test', 'service', vol.Schema({
+        'number': vol.Coerce(int)
+    }))
+
+    await hass.services.async_call('test', 'service', {
+        'number': '23'
+    }, blocking=True)
+    await hass.async_block_till_done()
+    assert len(events) == 1
+    assert events[0].data['service_data']['number'] == '23'
+    assert len(calls) == 1
+    assert calls[0].data['number'] == 23