diff --git a/src/projectM-engine/CustomShape.hpp b/src/projectM-engine/CustomShape.hpp
index 0dc092507..8aa526a2c 100755
--- a/src/projectM-engine/CustomShape.hpp
+++ b/src/projectM-engine/CustomShape.hpp
@@ -93,7 +93,7 @@ public:
 
     /// Returns any image url (usually used for texture maps) associated with the custom shape
     /// Will return empty string if none is set
-    inline const std::string & getImageUrl() {
+    inline const std::string & getImageUrl() const {
 		return imageUrl;
     }
 
diff --git a/src/projectM-engine/TextureManager.cpp b/src/projectM-engine/TextureManager.cpp
index deaa8c781..7680e98ac 100644
--- a/src/projectM-engine/TextureManager.cpp
+++ b/src/projectM-engine/TextureManager.cpp
@@ -5,12 +5,12 @@ TextureManager::TextureManager(std::string _presetURL): presetURL(_presetURL)
   ;
 }
 
-void TextureManager::loadTextures(PresetOutputs::cshape_container &shapes)
+void TextureManager::loadTextures(const PresetOutputs::cshape_container &shapes)
 {
   ;
 }
 
-void TextureManager::unloadTextures(PresetOutputs::cshape_container &shapes)
+void TextureManager::unloadTextures(const PresetOutputs::cshape_container &shapes)
 {
   ;
 }
diff --git a/src/projectM-engine/TextureManager.hpp b/src/projectM-engine/TextureManager.hpp
index 3d286f7ab..72d9cc70c 100644
--- a/src/projectM-engine/TextureManager.hpp
+++ b/src/projectM-engine/TextureManager.hpp
@@ -14,8 +14,8 @@ class TextureManager
 public:
 
   TextureManager(std::string _presetURL);
-  void loadTextures(PresetOutputs::cshape_container &shapes);
-  void unloadTextures(PresetOutputs::cshape_container &shapes);
+  void loadTextures(const PresetOutputs::cshape_container &shapes);
+  void unloadTextures(const PresetOutputs::cshape_container &shapes);
   GLuint getTexture(std::string imageUrl);
 
 };