diff --git a/core/SAL/SALConfig.hpp b/core/SAL/SALConfig.hpp
index c9bb3529..a1cb7884 100644
--- a/core/SAL/SALConfig.hpp
+++ b/core/SAL/SALConfig.hpp
@@ -4,7 +4,7 @@
 
 
 #include <stdint.h>
-#include "config/variant_config.h"
+#include "config/variant_config.hpp"
 
 #if defined BUILD_BOCHS
 
diff --git a/core/SAL/SALInst.hpp b/core/SAL/SALInst.hpp
index 378d44d3..0a376395 100644
--- a/core/SAL/SALInst.hpp
+++ b/core/SAL/SALInst.hpp
@@ -2,7 +2,7 @@
   #define __SAL_INSTANCE_HPP__
 
 #include "SALConfig.hpp"
-#include "config/variant_config.h"
+#include "config/variant_config.hpp"
 
 #ifdef BUILD_BOCHS
 
diff --git a/core/config/CMakeLists.txt b/core/config/CMakeLists.txt
index 2106bb16..49959b15 100644
--- a/core/config/CMakeLists.txt
+++ b/core/config/CMakeLists.txt
@@ -1,6 +1,6 @@
 #### Configuration file emitting BUILD_OVP/BOCHS defines ####
-configure_file(${CMAKE_CURRENT_SOURCE_DIR}/variant_config.h.in
-               ${CMAKE_CURRENT_BINARY_DIR}/variant_config.h)
+configure_file(${CMAKE_CURRENT_SOURCE_DIR}/variant_config.hpp.in
+               ${CMAKE_CURRENT_BINARY_DIR}/variant_config.hpp)
 
 OPTION(CONFIG_EVENT_CPULOOP             "Event source: Breakpoints" OFF)
 OPTION(CONFIG_EVENT_MEMREAD             "Event source: Memory reads" OFF)
diff --git a/core/config/variant_config.h.in b/core/config/variant_config.hpp.in
similarity index 100%
rename from core/config/variant_config.h.in
rename to core/config/variant_config.hpp.in