diff --git a/mbus/mbus.c b/mbus/mbus.c
index cefb157..34e5038 100644
--- a/mbus/mbus.c
+++ b/mbus/mbus.c
@@ -18,5 +18,5 @@ int mbus_init() {return 0;}
 ///
 /// Return current version of the library
 ///
-char*
+const char*
 mbus_get_current_version() {return "0.8.0";}
diff --git a/mbus/mbus.h b/mbus/mbus.h
index 7bc5b9f..2746c64 100644
--- a/mbus/mbus.h
+++ b/mbus/mbus.h
@@ -46,7 +46,7 @@ extern "C" {
 //
 //
 int mbus_init();
-char* mbus_get_current_version();
+const char* mbus_get_current_version();
 
 #ifdef __cplusplus
 }