diff --git a/lib/suppressions.cpp b/lib/suppressions.cpp
index 61c2594ce..2bfb1e772 100644
--- a/lib/suppressions.cpp
+++ b/lib/suppressions.cpp
@@ -306,7 +306,7 @@ bool Suppressions::isSuppressedLocal(const Suppressions::ErrorMessage &errmsg)
     return false;
 }
 
-void Suppressions::dump(std::ostream & out)
+void Suppressions::dump(std::ostream & out) const
 {
     out << "  <suppressions>" << std::endl;
     for (const Suppression &suppression : mSuppressions) {
diff --git a/lib/suppressions.h b/lib/suppressions.h
index 01e26ed4f..d6a186fb3 100644
--- a/lib/suppressions.h
+++ b/lib/suppressions.h
@@ -148,7 +148,7 @@ public:
      * @brief Create an xml dump of suppressions
      * @param out stream to write XML to
     */
-    void dump(std::ostream &out);
+    void dump(std::ostream &out) const;
 
     /**
      * @brief Returns list of unmatched local (per-file) suppressions.