diff --git a/src/sysvars.cpp b/src/sysvars.cpp
index ba05f87..60865b9 100644
--- a/src/sysvars.cpp
+++ b/src/sysvars.cpp
@@ -14,10 +14,6 @@
 # define DEBUG_SYSVARS 0
 #endif
 
-#if not defined(SYSVAR_FILE)
-    #define SYSVAR_FILE "/cfg.json"
-#endif
-
 template <typename T>
 T svGetV(const String & name, const T deflt)
 {
diff --git a/src/sysvars.hpp b/src/sysvars.hpp
index f966674..e43a605 100644
--- a/src/sysvars.hpp
+++ b/src/sysvars.hpp
@@ -7,6 +7,10 @@
 
 #include <Arduino.h>
 
+#if not defined(SYSVAR_FILE)
+    #define SYSVAR_FILE "/cfg.json"
+#endif
+
 enum {
     SV_OK = 0,
     SV_UNSPECIFIED_ERROR = -1,