diff --git a/src/TimingData.cpp b/src/TimingData.cpp
index 1c5e88c9ea..5c06652041 100644
--- a/src/TimingData.cpp
+++ b/src/TimingData.cpp
@@ -29,7 +29,7 @@ bool TimingData::empty() const
 	return true;
 }
 
-TimingData TimingData::CopyRange(int startRow, int endRow)
+TimingData TimingData::CopyRange(int startRow, int endRow) const
 {
 	TimingData tmp;
 	
diff --git a/src/TimingData.h b/src/TimingData.h
index 90c7f5b3f7..8cf239e2f0 100644
--- a/src/TimingData.h
+++ b/src/TimingData.h
@@ -54,7 +54,7 @@ public:
 	
 	~TimingData();
 	
-	TimingData CopyRange(int startRow, int endRow);
+	TimingData CopyRange(int startRow, int endRow) const;
 	/**
 	 * @brief Gets the actual BPM of the song,
 	 * while respecting a limit.