diff --git a/projects/mtg/src/OptionItem.cpp b/projects/mtg/src/OptionItem.cpp
index b79db651a..c6a782988 100644
--- a/projects/mtg/src/OptionItem.cpp
+++ b/projects/mtg/src/OptionItem.cpp
@@ -495,9 +495,9 @@ void OptionTheme::Render()
         author = "";
         bChecked = true;
         if (selections[value] == "Default")
-            sprintf(buf, JGE_GET_RES("graphics/themeinfo.txt").c_str());
+            sprintf(buf, "%s", JGE_GET_RES("graphics/themeinfo.txt").c_str());
         else
-            sprintf(buf, JGE_GET_RES("themes/%s/themeinfo.txt").c_str(), selections[value].c_str());
+            sprintf(buf, "%s%s", JGE_GET_RES("themes/%s/themeinfo.txt").c_str(), selections[value].c_str());
         std::ifstream file(buf);
         if (file)
         {
diff --git a/projects/mtg/src/WResourceManager.cpp b/projects/mtg/src/WResourceManager.cpp
index d987b9934..3a56a894e 100644
--- a/projects/mtg/src/WResourceManager.cpp
+++ b/projects/mtg/src/WResourceManager.cpp
@@ -832,7 +832,7 @@ int WResourceManager::dirOK(string dirname)
     return (_stat(fname, &statBuffer) >= 0 && // make sure it exists
                     statBuffer.st_mode & S_IFDIR); // and it's not a file
 #else
-    sprintf(fname, JGE_GET_RES(dirname).c_str());
+    sprintf(fname, "%s", JGE_GET_RES(dirname).c_str());
     struct stat st;
     if (stat(fname, &st) == 0) return 1;
 #endif