diff --git a/bin/check_samplesheet.py b/bin/check_samplesheet.py
index b7437c12..9b51c183 100755
--- a/bin/check_samplesheet.py
+++ b/bin/check_samplesheet.py
@@ -99,7 +99,7 @@ def check_samplesheet(file_in, file_out):
 
                 ## Check replicate column is integer
                 if not replicate.isdecimal():
-                    print_error("Replicate id not an integer!", "Line {}".format(lineNo), line)
+                    print_error("Replicate id not an integer!", "Line {}".format(line_number), line)
                     sys.exit(1)
 
                 ## Check antibody and control columns have valid values