diff --git a/subworkflows/local/vcf_variant_filtering.nf b/subworkflows/local/vcf_variant_filtering.nf
index 6dba51d..5cba729 100644
--- a/subworkflows/local/vcf_variant_filtering.nf
+++ b/subworkflows/local/vcf_variant_filtering.nf
@@ -16,7 +16,7 @@ workflow VCF_VARIANT_FILTERING {
 
     versions = Channel.empty()
 
-    if(params.exclude_expression  != null | params.include_expression  != null){
+    if(params.exclude_expression  != null || params.include_expression  != null){
 
         // filter vcf files using bcftools expressions
         BCFTOOLS_FILTER(