diff --git a/src/TR.jl b/src/TR.jl
index e5a0876..f005cba 100644
--- a/src/TR.jl
+++ b/src/TR.jl
@@ -82,7 +82,7 @@ elseif regType == "GL" # Grünwald-Letnikov fractional derivative regulariztion
     regMat = zeros(p,p);
 
     for i in 1:p
-        regMat[i:end, i] = regMat[1:end-i+1];
+        regMat[i:end, i] = C[1:end-i+1];
     end
 end