diff --git a/hecl/extern/boo b/hecl/extern/boo
index bd5ea3665..2bd9f8a55 160000
--- a/hecl/extern/boo
+++ b/hecl/extern/boo
@@ -1 +1 @@
-Subproject commit bd5ea36659f12e80f5bdd491cc206b781739b365
+Subproject commit 2bd9f8a553a0370b664ee98cc35ad817a8dc91d5
diff --git a/hecl/include/hecl/CVarCommons.hpp b/hecl/include/hecl/CVarCommons.hpp
index 3c9a66d9e..ec57f567c 100644
--- a/hecl/include/hecl/CVarCommons.hpp
+++ b/hecl/include/hecl/CVarCommons.hpp
@@ -99,6 +99,10 @@ struct CVarCommons {
 
   void setDeepColor(bool b) { m_deepColor->fromBoolean(b); }
 
+  bool getVariableFrameTime() const { return m_variableDt->toBoolean(); }
+
+  void setVariableFrameTime(bool b) { m_variableDt->fromBoolean(b); }
+
   std::string getLogFile() const { return m_logFile->toLiteral(); };
 
   void setLogFile(std::string_view log) { m_logFile->fromLiteral(log); }