diff --git a/embedding/browser/gtk/src/EmbedPrivate.cpp b/embedding/browser/gtk/src/EmbedPrivate.cpp
index e8e626ba664..2b1a8dc3ea8 100644
--- a/embedding/browser/gtk/src/EmbedPrivate.cpp
+++ b/embedding/browser/gtk/src/EmbedPrivate.cpp
@@ -486,7 +486,7 @@ EmbedPrivate::PopStartup(void)
 
 /* static */
 void
-EmbedPrivate::SetCompPath(char *aPath)
+EmbedPrivate::SetCompPath(const char *aPath)
 {
   if (sCompPath)
     free(sCompPath);
@@ -507,7 +507,7 @@ EmbedPrivate::SetAppComponents(const nsModuleComponentInfo* aComps,
 
 /* static */
 void
-EmbedPrivate::SetProfilePath(char *aDir, char *aName)
+EmbedPrivate::SetProfilePath(const char *aDir, const char *aName)
 {
   if (sProfileDir) {
     nsMemory::Free(sProfileDir);
diff --git a/embedding/browser/gtk/src/EmbedPrivate.h b/embedding/browser/gtk/src/EmbedPrivate.h
index 3b97dd27c57..bfb8d68db0b 100644
--- a/embedding/browser/gtk/src/EmbedPrivate.h
+++ b/embedding/browser/gtk/src/EmbedPrivate.h
@@ -85,10 +85,10 @@ class EmbedPrivate {
 
   static void PushStartup     (void);
   static void PopStartup      (void);
-  static void SetCompPath     (char *aPath);
+  static void SetCompPath     (const char *aPath);
   static void SetAppComponents (const nsModuleComponentInfo* aComps,
                                 int aNumComponents);
-  static void SetProfilePath  (char *aDir, char *aName);
+  static void SetProfilePath  (const char *aDir, const char *aName);
   static void SetDirectoryServiceProvider (nsIDirectoryServiceProvider * appFileLocProvider);
 
   nsresult OpenStream         (const char *aBaseURI, const char *aContentType);
diff --git a/embedding/browser/gtk/src/gtkmozembed.h b/embedding/browser/gtk/src/gtkmozembed.h
index 7a4087d0796..7d7568f2917 100644
--- a/embedding/browser/gtk/src/gtkmozembed.h
+++ b/embedding/browser/gtk/src/gtkmozembed.h
@@ -103,8 +103,9 @@ GtkType      gtk_moz_embed_get_type         (void);
 GtkWidget   *gtk_moz_embed_new              (void);
 void         gtk_moz_embed_push_startup     (void);
 void         gtk_moz_embed_pop_startup      (void);
-void         gtk_moz_embed_set_comp_path    (char *aPath);
-void         gtk_moz_embed_set_profile_path (char *aDir, char *aName);
+void         gtk_moz_embed_set_comp_path    (const char *aPath);
+void         gtk_moz_embed_set_profile_path (const char *aDir,
+                                             const char *aName);
 void         gtk_moz_embed_load_url         (GtkMozEmbed *embed, 
 					     const char *url);
 void         gtk_moz_embed_stop_load        (GtkMozEmbed *embed);
diff --git a/embedding/browser/gtk/src/gtkmozembed2.cpp b/embedding/browser/gtk/src/gtkmozembed2.cpp
index b35ca7e57ce..ef76c0538f9 100644
--- a/embedding/browser/gtk/src/gtkmozembed2.cpp
+++ b/embedding/browser/gtk/src/gtkmozembed2.cpp
@@ -824,7 +824,7 @@ gtk_moz_embed_pop_startup(void)
 }
 
 void
-gtk_moz_embed_set_comp_path(char *aPath)
+gtk_moz_embed_set_comp_path(const char *aPath)
 {
   EmbedPrivate::SetCompPath(aPath);
 }
@@ -837,7 +837,7 @@ gtk_moz_embed_set_app_components(const nsModuleComponentInfo* aComps,
 }
 
 void
-gtk_moz_embed_set_profile_path(char *aDir, char *aName)
+gtk_moz_embed_set_profile_path(const char *aDir, const char *aName)
 {
   EmbedPrivate::SetProfilePath(aDir, aName);
 }