diff --git a/lib/CalypFrame.cpp b/lib/CalypFrame.cpp
index 3473dbb..fddfd54 100644
--- a/lib/CalypFrame.cpp
+++ b/lib/CalypFrame.cpp
@@ -412,12 +412,12 @@ ClpULong CalypFrame::getTotalNumberOfPixels() const
   return numberPixels;
 }
 
-unsigned char CalypFrame::getChromaWidthRatio() const
+unsigned CalypFrame::getChromaWidthRatio() const
 {
   return d->m_pcPelFormat->log2ChromaWidth;
 }
 
-unsigned char CalypFrame::getChromaHeightRatio() const
+unsigned CalypFrame::getChromaHeightRatio() const
 {
   return d->m_pcPelFormat->log2ChromaHeight;
 }
diff --git a/lib/CalypFrame.h b/lib/CalypFrame.h
index f83dc5d..7554cc6 100644
--- a/lib/CalypFrame.h
+++ b/lib/CalypFrame.h
@@ -214,13 +214,13 @@ public:
 	 * Get chroma width ratio
 	 * @return ratio multiple of 2
 	 */
-  unsigned char getChromaWidthRatio() const;
+  unsigned getChromaWidthRatio() const;
 
   /**
 	 * Get chroma height ratio
 	 * @return ratio multiple of 2
 	 */
-  unsigned char getChromaHeightRatio() const;
+  unsigned getChromaHeightRatio() const;
 
   /**
 	 * Get number of pixels in each chroma channel