diff --git a/src/main/java/edu/hm/hafner/analysis/parser/violations/SarifAdapter.java b/src/main/java/edu/hm/hafner/analysis/parser/violations/SarifAdapter.java
index 95cc0d6d3..2f872bade 100644
--- a/src/main/java/edu/hm/hafner/analysis/parser/violations/SarifAdapter.java
+++ b/src/main/java/edu/hm/hafner/analysis/parser/violations/SarifAdapter.java
@@ -42,8 +42,7 @@ void extractAdditionalProperties(final IssueBuilder builder, final Violation vio
 
     @Override
     boolean isValid(final Violation violation) {
-        return !(violation.getSpecifics().containsKey("suppressed")
-            && violation.getSpecifics().get("suppressed").equals("true"));
+        return violation.getSpecifics().getOrDefault("suppressed", "false").equals("false");
     }
 
     private String removePrefix(final String fileName) {