diff --git a/inst/cta/include/GCTACubePsf.hpp b/inst/cta/include/GCTACubePsf.hpp
index dc14c1a..59a989c 100644
--- a/inst/cta/include/GCTACubePsf.hpp
+++ b/inst/cta/include/GCTACubePsf.hpp
@@ -92,7 +92,7 @@ public:
     void               read(const GFits& fits);
     void               write(GFits& file) const;
     void               load(const std::string& filename);
-    void               save(const std::string& filename, const bool& clobber) const;
+    void               save(const std::string& filename, const bool& clobber = false) const;
     const std::string& filename(void) const;
     std::string        print(const GChatter& chatter = NORMAL) const;
 
diff --git a/inst/cta/pyext/GCTACubePsf.i b/inst/cta/pyext/GCTACubePsf.i
index 5ed52ba..9ead09d 100644
--- a/inst/cta/pyext/GCTACubePsf.i
+++ b/inst/cta/pyext/GCTACubePsf.i
@@ -84,7 +84,7 @@ public:
     void               read(const GFits& fits);
     void               write(GFits& file) const;
     void               load(const std::string& filename);
-    void               save(const std::string& filename, const bool& clobber) const;
+    void               save(const std::string& filename, const bool& clobber = false) const;
     const std::string& filename(void) const;
 };