diff --git a/external/json_checker/JSON_checker.c b/external/json_checker/JSON_checker.c
index 66438d3..ad0d3e1 100644
--- a/external/json_checker/JSON_checker.c
+++ b/external/json_checker/JSON_checker.c
@@ -27,7 +27,7 @@ SOFTWARE.
 */
 
 #include <stdlib.h>
-#include "JSON_checker.h"
+#include "json_checker/JSON_checker.h"
 
 #define true  1
 #define false 0
diff --git a/external/json_checker/include/json_checker/JSON_checker.h b/external/json_checker/include/json_checker/JSON_checker.h
index 47c2299..f577aee 100644
--- a/external/json_checker/include/json_checker/JSON_checker.h
+++ b/external/json_checker/include/json_checker/JSON_checker.h
@@ -1,5 +1,12 @@
+
+#pragma once
+
 /* JSON_checker.h */
 
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
 typedef struct JSON_checker_struct {
     int state;
     int depth;
@@ -11,3 +18,7 @@ typedef struct JSON_checker_struct {
 extern JSON_checker new_JSON_checker(int depth);
 extern int  JSON_checker_char(JSON_checker jc, int next_char);
 extern int  JSON_checker_done(JSON_checker jc);
+
+#ifdef __cplusplus
+} /* extern "C" */
+#endif /* __cplusplus */
diff --git a/premake/premake5.lua b/premake/premake5.lua
index dc975e5..e5bc25f 100644
--- a/premake/premake5.lua
+++ b/premake/premake5.lua
@@ -23,10 +23,12 @@ solution "demboyz"
             "../demboyz/**.h",
             "../demboyz/**.cpp",
             "../external/**.h",
-            "../external/**.cpp"
+            "../external/**.cpp",
+            "../external/**.c"
         }
         includedirs
         {
+            "../external/json_checker/include",
             "../external/sourcesdk/include",
             "../external/rapidjson-1.0.2/include",
             "../demboyz"