diff --git a/src/nf_modules/bwa/main.nf b/src/nf_modules/bwa/main.nf
index 11aac6062f2c2eb2317073862cb273361c59c257..02f641b8f4266ad47ca8ab10cc1f13e24d87a498 100644
--- a/src/nf_modules/bwa/main.nf
+++ b/src/nf_modules/bwa/main.nf
@@ -49,7 +49,7 @@ process mapping_fastq {
   if (file_id instanceof List){
     library = file_id[0]
     file_prefix = file_id[0]
-  } else if (file_id instanceof Map)
+  } else if (file_id instanceof Map) {
       library = file_id[0]
       file_prefix = file_id[0]
       if (file_id.containsKey('library')) {