diff --git a/src/Cocoa/Cocoa_Window.mm b/src/Cocoa/Cocoa_Window.mm
index 1f864cf587..bd8c2e3c42 100644
--- a/src/Cocoa/Cocoa_Window.mm
+++ b/src/Cocoa/Cocoa_Window.mm
@@ -111,7 +111,7 @@ Cocoa_Window::Cocoa_Window (const Standard_CString theTitle,
   myYBottom (thePxTop + thePxHeight)
 {
 #if defined(TARGET_OS_IPHONE) && TARGET_OS_IPHONE
-  //
+  (void )theTitle;
 #else
   if (thePxWidth <= 0 || thePxHeight <= 0)
   {
diff --git a/src/OpenGl/OpenGl_Context.cxx b/src/OpenGl/OpenGl_Context.cxx
index 0e294b4721..4535e8e6c9 100644
--- a/src/OpenGl/OpenGl_Context.cxx
+++ b/src/OpenGl/OpenGl_Context.cxx
@@ -787,7 +787,7 @@ Standard_Boolean OpenGl_Context::SetSwapInterval (const Standard_Integer theInte
     return Standard_True;
   }
 #elif defined(TARGET_OS_IPHONE) && TARGET_OS_IPHONE
-  //
+  (void )theInterval; // vsync cannot be turned OFF on iOS
 #elif defined(__APPLE__)
   if (::CGLSetParameter (CGLGetCurrentContext(), kCGLCPSwapInterval, &theInterval) == kCGLNoError)
   {