diff --git a/src/nf_modules/multiqc/main.nf b/src/nf_modules/multiqc/main.nf
index 5eb2b1b749e76ec21ea0cc4e68c963aeddaee462..f33386d23c3c2c2a8d916cfd43a6d93752235e76 100644
--- a/src/nf_modules/multiqc/main.nf
+++ b/src/nf_modules/multiqc/main.nf
@@ -36,6 +36,7 @@ workflow multiqc {
         it
       }
     }
+    .flatten()
     .unique()
     .set { report_cleaned }
     multiqc_default(report_cleaned.collect())