diff --git a/modules/picard_hs_metrics.json b/modules/picard_hs_metrics.json
index 3f26fadd99c4a0d951a9411bf0ba31e8cb0bcc72..5af4566688bef7adb554535cd6ba9d599280e00f 100644
--- a/modules/picard_hs_metrics.json
+++ b/modules/picard_hs_metrics.json
@@ -10,7 +10,7 @@
     "BAIT_DESIGN_EFFICIENCY": { "type": "integer" },
     "BAIT_SET": { "type": "string" },
     "BAIT_TERRITORY": { "type": "integer" },
-    "FOLD_80_BASE_PENALTY": { "type": "number" },
+    "FOLD_80_BASE_PENALTY": { "type": ["integer", "number", "string"] },
     "FOLD_ENRICHMENT": { "type": "number" },
     "GC_DROPOUT": { "type": "number" },
     "GENOME_SIZE": { "type": "integer" },