diff --git a/src/nvtt/InputOptions.cpp b/src/nvtt/InputOptions.cpp
index 8179799..ba3934e 100644
--- a/src/nvtt/InputOptions.cpp
+++ b/src/nvtt/InputOptions.cpp
@@ -124,7 +124,14 @@ void InputOptions::reset()
 
 
 // Setup the input image.
-void InputOptions::setTextureLayout(TextureType type, int width, int height, int depth /*= 1*/, int arraySize /*= 1*/)
+// Overload for ABI compatibility
+void InputOptions::setTextureLayout(TextureType type, int width, int height, int depth /*= 1*/)
+{
+    setTextureLayout(type, width, height, depth, 1);
+}
+
+// Setup the input image.
+void InputOptions::setTextureLayout(TextureType type, int width, int height, int depth, int arraySize)
 {
     // Validate arguments.
     nvCheck(width >= 0);
diff --git a/src/nvtt/nvtt.h b/src/nvtt/nvtt.h
index d86a503..6a5a8a3 100644
--- a/src/nvtt/nvtt.h
+++ b/src/nvtt/nvtt.h
@@ -290,7 +290,9 @@ namespace nvtt
         NVTT_API void reset();
 
         // Setup input layout.
-        NVTT_API void setTextureLayout(TextureType type, int w, int h, int d = 1, int arraySize = 1);
+        // Overload for ABI compatibility
+        NVTT_API void setTextureLayout(TextureType type, int w, int h, int d = 1 /*, arraysize = 1 */);
+        NVTT_API void setTextureLayout(TextureType type, int w, int h, int d, int arraySize);
         NVTT_API void resetTextureLayout();
 
         // Set mipmap data. Copies the data.