diff --git a/include/utility.cpp b/include/utility.cpp
index 9ff0e0554..1e8fcca7d 100755
--- a/include/utility.cpp
+++ b/include/utility.cpp
@@ -435,6 +435,7 @@ const char* esc(
         case 'f' : *s2++ = '\f'; break;
         case 'n' : *s2++ = '\n'; break;
         case 'r' : *s2++ = '\r'; break;
+        case 's' : *s2++ = ' '; break;
         case 't' : *s2++ = '\t'; break;
         default  :
         {