diff --git a/conf/test_full.config b/conf/test_full.config
index 17eef6c3..fe8d212c 100644
--- a/conf/test_full.config
+++ b/conf/test_full.config
@@ -18,4 +18,8 @@ params {
     fasta = 'https://raw.githubusercontent.com/nf-core/test-datasets/mhcquant/testdata/UP000005640_9606.fasta'
     input = 'https://raw.githubusercontent.com/nf-core/test-datasets/mhcquant/testdata/sample_sheet_full.tsv'
 
+    // Test multiple modifications
+    fixed_mods    = 'Oxidation (M),Carbamidomethyl (C)'
+    variable_mods = 'Oxidation (M),Carbamidomethyl (C)'
+
 }