diff --git a/include/PDecayChannel.h b/include/PDecayChannel.h
index 0650b0c..b3dee14 100644
--- a/include/PDecayChannel.h
+++ b/include/PDecayChannel.h
@@ -62,7 +62,7 @@ class PDecayChannel : public TObject {
     void AddChannel(Double_t w, const char *d1, const char *d2);
     void AddChannel(Double_t w, const char *d1, const char *d2, const char *d3);
     void AddChannel(Double_t w, const char *d1, const char *d2, const char *d3, const char *d4);
-    void AddChannel(Double_t w, Int_t nd, char **ld);
+    void AddChannel(Double_t w, Int_t nd, const char **ld);
 
     // Get the information out of the class ...
     Double_t GetWeight();
diff --git a/src/PDecayChannel.cc b/src/PDecayChannel.cc
index acecf06..68f4ccb 100644
--- a/src/PDecayChannel.cc
+++ b/src/PDecayChannel.cc
@@ -329,7 +329,7 @@ void PDecayChannel::AddChannel(Double_t w, const char *d1, const char *d2, const
 // --------------------------------------------------------------------------
 
 // --------------------------------------------------------------------------
-void PDecayChannel::AddChannel(Double_t w, Int_t nd, char **ld) {
+void PDecayChannel::AddChannel(Double_t w, Int_t nd, const char **ld) {
     // The channel describes a decay into nd daughter particles represented by
     // an array of their names ld and branching ratio w.
     if (!Daughters.GetArray()) {