diff --git a/platform/platform_ios.mm b/platform/platform_ios.mm
index 0e177ce123..c8ebc7dcde 100644
--- a/platform/platform_ios.mm
+++ b/platform/platform_ios.mm
@@ -44,15 +44,15 @@ Platform::Platform()
   NSBundle * bundle = [NSBundle mainBundle];
   NSString * path = [bundle resourcePath];
   m_resourcesDir = [path UTF8String];
-  m_resourcesDir += '/';
+  m_resourcesDir += "/";
 
   NSArray * dirPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
   NSString * docsDir = [dirPaths objectAtIndex:0];
   m_writableDir = [docsDir UTF8String];
-  m_writableDir += '/';
+  m_writableDir += "/";
   m_settingsDir = m_writableDir;
   m_tmpDir = [NSHomeDirectory() UTF8String];
-  m_tmpDir += '/tmp/';
+  m_tmpDir += "/tmp/";
 
   // Hardcoding screen resolution depending on the device we are running.
   m_impl->m_visualScale = 1.0;