diff --git a/wrap/FileWriter.h b/wrap/FileWriter.h
index f081b86ed..ecafc0c35 100644
--- a/wrap/FileWriter.h
+++ b/wrap/FileWriter.h
@@ -25,7 +25,7 @@ public:
 	std::ostringstream oss; ///< Primary stream for operating on the file
 
 	/** Create a writer with a filename and delimiter for the header comment */
-	FileWriter(const std::string& filename, bool verbose, const std::string& comment_str="");
+	FileWriter(const std::string& filename, bool verbose, const std::string& comment_str);
 
 	/** Writes the contents of the stringstream to the file, checking if actually new */
 	void emit(bool add_header, bool force=false) const;
diff --git a/wrap/Method.cpp b/wrap/Method.cpp
index 7261c88a0..aeddca2e1 100644
--- a/wrap/Method.cpp
+++ b/wrap/Method.cpp
@@ -30,7 +30,7 @@ void Method::matlab_mfile(const string& classPath) const {
 
   // open destination m-file
   string wrapperFile = classPath + "/" + name + ".m";
-  FileWriter file(wrapperFile, verbose_);
+  FileWriter file(wrapperFile, verbose_, "%");
 
   // generate code
   string returnType = returnVal.matlab_returnType();
diff --git a/wrap/StaticMethod.cpp b/wrap/StaticMethod.cpp
index 3dd9e7c8b..7bdba650b 100644
--- a/wrap/StaticMethod.cpp
+++ b/wrap/StaticMethod.cpp
@@ -31,7 +31,7 @@ void StaticMethod::matlab_mfile(const string& toolboxPath, const string& classNa
   // open destination m-file
 	string full_name = className + "_" + name;
   string wrapperFile = toolboxPath + "/" + full_name + ".m";
-  FileWriter file(wrapperFile, verbose);
+  FileWriter file(wrapperFile, verbose, "%");
 
   // generate code
   string returnType = returnVal.matlab_returnType();