diff --git a/src/monocoque/monocoque.c b/src/monocoque/monocoque.c
index c483d91..6c1cfc7 100644
--- a/src/monocoque/monocoque.c
+++ b/src/monocoque/monocoque.c
@@ -63,10 +63,13 @@ int main(int argc, char** argv)
     create_user_dir("/.config/");
     create_user_dir("/.cache/");
     char* config_file_str = ( char* ) malloc(1 + strlen(home_dir_str) + strlen("/.config/") + strlen("monocoque/monocoque.config"));
-    size_t diameters_file_sz = 1 + strlen(home_dir_str) + strlen("/.config/") + strlen("monocoque/diameters.config");
-    char* diameters_file_str = ( char* ) malloc(1 + strlen(home_dir_str) + strlen("/.config/") + strlen("monocoque/diameters.json"));
+
+    size_t diameters_file_sz = snprintf(NULL, 0, "%s/.config/monocoque/diameters.config", home_dir_str);
+    diameters_file_sz += 1;
+    char* diameters_file_str = ( char* ) malloc(diameters_file_sz);
     snprintf(diameters_file_str, diameters_file_sz, "%s/.config/monocoque/diameters.config", home_dir_str);
 
+
     char* cache_dir_str = ( char* ) malloc(1 + strlen(home_dir_str) + strlen("/.cache/monocoque/"));
     strcpy(config_file_str, home_dir_str);
     strcat(config_file_str, "/.config/");
@@ -103,6 +106,7 @@ int main(int argc, char** argv)
     free(diameters_file_str);
 
     slogi("Loading configuration file: %s", config_file_str);
+    slogd("using diameters file %s", ms->tyre_diameter_config);
     config_t cfg;
     config_init(&cfg);
     config_setting_t* config_devices = NULL;