diff --git a/libcef_dll/wrapper/cef_message_router.cc b/libcef_dll/wrapper/cef_message_router.cc
index 1a231a4fb..24be8fca1 100644
--- a/libcef_dll/wrapper/cef_message_router.cc
+++ b/libcef_dll/wrapper/cef_message_router.cc
@@ -222,9 +222,10 @@ class CefMessageRouterBrowserSideImpl : public CefMessageRouterBrowserSide {
 
       return visitor.count();
     } else if (browser.get()) {
-      return browser_query_info_map_.size(browser->GetIdentifier());
+      return static_cast<int>(
+          browser_query_info_map_.size(browser->GetIdentifier()));
     } else {
-      return browser_query_info_map_.size();
+      return static_cast<int>(browser_query_info_map_.size());
     }
 
     return 0;
@@ -776,9 +777,10 @@ class CefMessageRouterRendererSideImpl : public CefMessageRouterRendererSide {
 
       return visitor.count();
     } else if (browser.get()) {
-      return browser_request_info_map_.size(browser->GetIdentifier());
+      return static_cast<int>(
+          browser_request_info_map_.size(browser->GetIdentifier()));
     } else {
-      return browser_request_info_map_.size();
+      return static_cast<int>(browser_request_info_map_.size());
     }
 
     return 0;
diff --git a/tests/unittests/message_router_unittest.cc b/tests/unittests/message_router_unittest.cc
index 5ef5c5234..9ac763b50 100644
--- a/tests/unittests/message_router_unittest.cc
+++ b/tests/unittests/message_router_unittest.cc
@@ -2238,7 +2238,8 @@ class MultiQueryManagerMap :
     EXPECT_EQ(it, manager_map_.end());
 
     MultiQueryManager* manager =
-        new MultiQueryManager(url, synchronous, manager_map_.size() * 1000);
+        new MultiQueryManager(url, synchronous,
+            static_cast<int>(manager_map_.size()) * 1000);
     manager->AddObserver(this);
     manager_map_.insert(std::make_pair(url, manager));
 
@@ -2408,8 +2409,8 @@ class MultiQueryManagerMap :
 
   static std::string GetNameForURL(const std::string& url) {
     // Extract the file name without extension.
-    int pos1 = url.rfind("/");
-    int pos2 = url.rfind(".");
+    int pos1 = static_cast<int>(url.rfind("/"));
+    int pos2 = static_cast<int>(url.rfind("."));
     EXPECT_TRUE(pos1 >= 0 && pos2 >= 0 && pos1 < pos2);
     return url.substr(pos1 + 1, pos2 - pos1 - 1);
   }