diff --git a/sequana/rules/peak_calling/macs2/macs2.rules b/sequana/rules/peak_calling/macs2/macs2.rules
index 00487181a..1f1c50666 100644
--- a/sequana/rules/peak_calling/macs2/macs2.rules
+++ b/sequana/rules/peak_calling/macs2/macs2.rules
@@ -16,23 +16,23 @@ rule macs2:
     """
 
     input:
-        bam = __macs2__input_treatment,
-        ctl = __macs2__input_control
+        bam = __macs2__input_treatment
     params:
         gsize = config["macs2"]["genomeSize"],
         readLength = config["macs2"]["readLength"],
         qval = config["macs2"]["qval"],
         options = config["macs2"]['options'],
-        prefix =  __macs2__output
+        prefix =  __macs2__output,
+        ctl = __macs2__input_control
     log:
         __macs2__log
     output:
         touch(__macs2__output_done)
     threads: 1
     run:
-        if input.ctl == "None":
+        if input.ctl == None:
             shell(""" macs2 callpeak -t {input.bam}  -f BAM -g {params.gsize} -n {params.prefix}
                     --extsize={params.readLength} -q {params.pval} {params.options} 2> {log}""")
         else:
-            shell(""" macs2 callpeak -t {input.bam} -c {input.ctl}  -f BAM -g {params.gsize} -n {params.prefix}
+            shell(""" macs2 callpeak -t {input.bam} -c {params.ctl}  -f BAM -g {params.gsize} -n {params.prefix}
                      --extsize={params.readLength} -q {params.pval} {params.options} 2> {log}""")