diff --git a/src/harness/harness.c b/src/harness/harness.c
index 54caa34d..51072745 100644
--- a/src/harness/harness.c
+++ b/src/harness/harness.c
@@ -224,7 +224,7 @@ void Harness_DetectAndSetWorkingDirectory(char* argv0) {
         if (access("DATA/GENERAL.TXT", F_OK) == 0) {
             // good, found
         } else {
-            gHarness_platform.GetPrefPath("dethrace", pref_path);
+            gHarness_platform.GetPrefPath(pref_path, "dethrace");
             path = pref_path;
         }
     }
@@ -481,7 +481,7 @@ static int Harness_Ini_Callback(void* user, const char* section, const char* nam
 int Harness_ProcessIniFile(void) {
     int i;
     char path[1024];
-    gHarness_platform.GetPrefPath("dethrace", path);
+    gHarness_platform.GetPrefPath(path, "dethrace");
 
     strcat(path, "dethrace.ini");
 
diff --git a/src/harness/include/harness/hooks.h b/src/harness/include/harness/hooks.h
index 73e0027c..41afc43e 100644
--- a/src/harness/include/harness/hooks.h
+++ b/src/harness/include/harness/hooks.h
@@ -47,7 +47,7 @@ typedef struct tHarness_platform {
     void* (*GL_GetProcAddress)(const char* name);
     void (*GetViewport)(int* x, int* y, float* width_multiplier, float* height_multiplier);
 
-    void (*GetPrefPath)(char* app_name, char* path);
+    void (*GetPrefPath)(char* path, char* app_name);
 
 } tHarness_platform;
 
diff --git a/src/harness/platforms/null.c b/src/harness/platforms/null.c
index be2b0e54..c25fe616 100644
--- a/src/harness/platforms/null.c
+++ b/src/harness/platforms/null.c
@@ -1,4 +1,5 @@
 #include "null.h"
+#include <string.h>
 
 static uint32_t null_time;
 
@@ -53,6 +54,10 @@ static uint32_t null_getticks(void) {
     return null_time;
 }
 
+static void null_get_pref_path(char* path, char* app_name) {
+    strcpy(path, ".");
+}
+
 void Null_Platform_Init(tHarness_platform* platform) {
     null_time = 0;
     platform->ProcessWindowMessages = null_get_and_handle_message;
@@ -68,4 +73,5 @@ void Null_Platform_Init(tHarness_platform* platform) {
     platform->ShowErrorMessage = null_show_error_message;
 
     platform->Renderer_SetPalette = null_set_palette;
+    platform->GetPrefPath = null_get_pref_path;
 }
diff --git a/src/harness/platforms/sdl1.c b/src/harness/platforms/sdl1.c
index ec9d7ccc..295f0bf5 100644
--- a/src/harness/platforms/sdl1.c
+++ b/src/harness/platforms/sdl1.c
@@ -286,7 +286,7 @@ static void SDL1_Harness_GetViewport(int* x, int* y, float* width_multipler, flo
     *height_multiplier = viewport.scale_y;
 }
 
-static void SDL1_Harness_GetPrefPath(char* app_name, char* path) {
+static void SDL1_Harness_GetPrefPath(char* path, char* app_name) {
     // SDL_GetPrefPath not in SDL1. We could implement it if we really needed to.
     // for now, just return the current path
     strcpy(path, ".");
diff --git a/src/harness/platforms/sdl2.c b/src/harness/platforms/sdl2.c
index eab7b385..f561de2e 100644
--- a/src/harness/platforms/sdl2.c
+++ b/src/harness/platforms/sdl2.c
@@ -367,7 +367,7 @@ static void SDL2_Harness_GetViewport(int* x, int* y, float* width_multipler, flo
     *height_multiplier = viewport.scale_y;
 }
 
-static void SDL2_Harness_GetPrefPath(char* app_name, char* path) {
+static void SDL2_Harness_GetPrefPath(char* path, char* app_name) {
     char* sdl_path = SDL2_GetPrefPath(NULL, app_name);
     strcpy(path, sdl_path);
     SDL2_free(sdl_path);