diff --git a/tests/cefclient/browser/browser_window_osr_mac.mm b/tests/cefclient/browser/browser_window_osr_mac.mm
index b7984f465..daee4abe3 100644
--- a/tests/cefclient/browser/browser_window_osr_mac.mm
+++ b/tests/cefclient/browser/browser_window_osr_mac.mm
@@ -194,7 +194,7 @@ NSPoint ConvertPointFromWindowToScreen(NSWindow* window, NSPoint point) {
   }
 
   browser->GetHost()->SendMouseClickEvent(mouseEvent, type, isUp,
-                                          [event clickCount]);
+                                          static_cast<int>([event clickCount]));
 }
 
 - (void)mouseDown:(NSEvent*)event {
@@ -362,7 +362,7 @@ NSPoint ConvertPointFromWindowToScreen(NSWindow* window, NSPoint point) {
     CefTouchEvent touch_event;
 
     // NSTouch.identity is unique during the life of the touch
-    touch_event.id = touch.identity.hash;
+    touch_event.id = static_cast<int>(touch.identity.hash);
     touch_event.type = [self getTouchPhase:phase];
 
     NSPoint scaled_pos = [touch normalizedPosition];
@@ -479,10 +479,10 @@ NSPoint ConvertPointFromWindowToScreen(NSWindow* window, NSPoint point) {
   CGEventRef cgEvent = [event CGEvent];
   DCHECK(cgEvent);
 
-  int deltaX =
-      CGEventGetIntegerValueField(cgEvent, kCGScrollWheelEventPointDeltaAxis2);
-  int deltaY =
-      CGEventGetIntegerValueField(cgEvent, kCGScrollWheelEventPointDeltaAxis1);
+  int deltaX = static_cast<int>(
+      CGEventGetIntegerValueField(cgEvent, kCGScrollWheelEventPointDeltaAxis2));
+  int deltaY = static_cast<int>(
+      CGEventGetIntegerValueField(cgEvent, kCGScrollWheelEventPointDeltaAxis1));
 
   CefMouseEvent mouseEvent;
   [self getMouseEvent:mouseEvent forEvent:event];
@@ -654,7 +654,7 @@ NSPoint ConvertPointFromWindowToScreen(NSWindow* window, NSPoint point) {
   mouseEvent.x = client::DeviceToLogical(point.x, device_scale_factor);
   mouseEvent.y = client::DeviceToLogical(point.y, device_scale_factor);
 
-  mouseEvent.modifiers = [NSEvent modifierFlags];
+  mouseEvent.modifiers = static_cast<uint32>([NSEvent modifierFlags]);
 }
 
 - (int)getModifiersForEvent:(NSEvent*)event {
diff --git a/tests/cefclient/browser/text_input_client_osr_mac.mm b/tests/cefclient/browser/text_input_client_osr_mac.mm
index a0df0ff84..8e3e902ee 100644
--- a/tests/cefclient/browser/text_input_client_osr_mac.mm
+++ b/tests/cefclient/browser/text_input_client_osr_mac.mm
@@ -30,7 +30,7 @@ cef_color_t CefColorFromNSColor(NSColor* color) {
 // third_party/WebKit/Source/WebKit/mac/WebView/WebHTMLView.mm
 void ExtractUnderlines(NSAttributedString* string,
                        std::vector<CefCompositionUnderline>* underlines) {
-  int length = [[string string] length];
+  int length = static_cast<int>([[string string] length]);
   int i = 0;
   while (i < length) {
     NSRange range;
@@ -52,7 +52,7 @@ void ExtractUnderlines(NSAttributedString* string,
                                           [style intValue] > 1};
       underlines->push_back(line);
     }
-    i = range.location + range.length;
+    i = static_cast<int>(range.location + range.length);
   }
 }
 
@@ -131,7 +131,7 @@ extern NSString* NSTextInputReplacementRangeAttributeName;
 
   BOOL isAttributedString = [aString isKindOfClass:[NSAttributedString class]];
   NSString* im_text = isAttributedString ? [aString string] : aString;
-  int length = [im_text length];
+  int length = static_cast<int>([im_text length]);
 
   // |markedRange_| will get set in a callback from ImeSetComposition().
   selectedRange_ = newSelRange;
@@ -157,9 +157,10 @@ extern NSString* NSTextInputReplacementRangeAttributeName;
         static_cast<int>(replacementRange.location),
         static_cast<int>(NSMaxRange(replacementRange))};
   } else if (!handlingKeyDown_) {
-    CefRange replacement_range(replacementRange.location,
-                               NSMaxRange(replacementRange));
-    CefRange selection_range(newSelRange.location, NSMaxRange(newSelRange));
+    CefRange replacement_range(static_cast<int>(replacementRange.location),
+                               static_cast<int>(NSMaxRange(replacementRange)));
+    CefRange selection_range(static_cast<int>(newSelRange.location),
+                             static_cast<int>(NSMaxRange(newSelRange)));
 
     browser_->GetHost()->ImeSetComposition(markedText_, underlines_,
                                            replacement_range, selection_range);
@@ -316,7 +317,8 @@ extern NSString* NSTextInputReplacementRangeAttributeName;
     // |selectedRange_| is the range being selected inside the marked text.
     browser_->GetHost()->ImeSetComposition(
         markedText_, underlines_, setMarkedTextReplacementRange_,
-        CefRange(selectedRange_.location, NSMaxRange(selectedRange_)));
+        CefRange(static_cast<int>(selectedRange_.location),
+                 static_cast<int>(NSMaxRange(selectedRange_))));
   } else if (oldHasMarkedText_ && !hasMarkedText_ && !textInserted) {
     // There was no marked text or inserted text. Complete or cancel the
     // composition.
diff --git a/tests/cefclient/renderer/performance_test.cc b/tests/cefclient/renderer/performance_test.cc
index 51f906181..9946a683c 100644
--- a/tests/cefclient/renderer/performance_test.cc
+++ b/tests/cefclient/renderer/performance_test.cc
@@ -47,7 +47,7 @@ class V8Handler : public CefV8Handler {
             // Execute the test.
             int64 delta = kPerfTests[i].test(kPerfTests[i].iterations);
 
-            retval = CefV8Value::CreateInt(delta);
+            retval = CefV8Value::CreateInt(static_cast<int32>(delta));
             found = true;
             break;
           }
diff --git a/tests/ceftests/message_router_multi_query_unittest.cc b/tests/ceftests/message_router_multi_query_unittest.cc
index 7e79db111..9e842089c 100644
--- a/tests/ceftests/message_router_multi_query_unittest.cc
+++ b/tests/ceftests/message_router_multi_query_unittest.cc
@@ -1171,7 +1171,7 @@ class MultiQueryMultiHandlerTestHandler : public SingleLoadTestHandler,
    private:
     MultiQueryMultiHandlerTestHandler* test_handler_;
     const int index_;
-    int query_id_;
+    int64 query_id_;
   };
 
   MultiQueryMultiHandlerTestHandler(bool synchronous,
diff --git a/tests/ceftests/run_all_unittests.cc b/tests/ceftests/run_all_unittests.cc
index 19bd91670..427b3a708 100644
--- a/tests/ceftests/run_all_unittests.cc
+++ b/tests/ceftests/run_all_unittests.cc
@@ -63,7 +63,7 @@ void sleep(int64 ms) {
 #if defined(OS_WIN)
   Sleep(ms);
 #elif defined(OS_POSIX)
-  usleep(ms * 1000);
+  usleep(static_cast<useconds_t>(ms * 1000));
 #else
 #error Unsupported platform
 #endif