diff --git a/src/base/match.cc b/src/base/match.cc
index dc621b482f..03f425f2e5 100644
--- a/src/base/match.cc
+++ b/src/base/match.cc
@@ -43,6 +43,12 @@ ObjectMatch::ObjectMatch(const string &expr)
     setExpression(expr);
 }
 
+void
+ObjectMatch::add(const ObjectMatch &other)
+{
+    tokens.insert(tokens.end(), other.tokens.begin(), other.tokens.end());
+}
+
 void
 ObjectMatch::setExpression(const string &expr)
 {
diff --git a/src/base/match.hh b/src/base/match.hh
index 6e1f03b804..3ef4c81921 100644
--- a/src/base/match.hh
+++ b/src/base/match.hh
@@ -47,6 +47,7 @@ class ObjectMatch
   public:
     ObjectMatch();
     ObjectMatch(const std::string &expression);
+    void add(const ObjectMatch &other);
     void setExpression(const std::string &expression);
     void setExpression(const std::vector<std::string> &expression);
     bool match(const std::string &name) const
diff --git a/src/base/trace.hh b/src/base/trace.hh
index ddf936ecd7..ee8737243e 100644
--- a/src/base/trace.hh
+++ b/src/base/trace.hh
@@ -86,6 +86,9 @@ class Logger
     /** Set objects to ignore */
     void setIgnore(ObjectMatch &ignore_) { ignore = ignore_; }
 
+    /** Add objects to ignore */
+    void addIgnore(const ObjectMatch &ignore_) { ignore.add(ignore_); }
+
     virtual ~Logger() { }
 };
 
diff --git a/src/python/pybind11/debug.cc b/src/python/pybind11/debug.cc
index 8fcd0cdbcc..de8b103163 100644
--- a/src/python/pybind11/debug.cc
+++ b/src/python/pybind11/debug.cc
@@ -75,7 +75,7 @@ ignore(const char *expr)
 {
     ObjectMatch ignore(expr);
 
-    Trace::getDebugLogger()->setIgnore(ignore);
+    Trace::getDebugLogger()->addIgnore(ignore);
 }
 
 void