diff -r 2b9f54d14cc2 -r 066e557ac453 plover-gtk/stockicons.c
--- a/plover-gtk/stockicons.c	Sat Nov 15 19:04:45 2014 +0000
+++ b/plover-gtk/stockicons.c	Fri Apr 15 13:05:48 2016 +0100
@@ -101,7 +101,7 @@
     if (plover_pixbuf_supports_svg())
     {
 	source=gtk_icon_source_new();
-	s=g_strconcat(name,".svg");
+	s=g_strconcat(name,".svg",NULL);
 	filename=g_build_filename(prefix?prefix:"/usr",
 	  "share/icons/hicolor/scalable",type,s,NULL);
 	g_free(s);
@@ -112,7 +112,7 @@
     }
     else
     {
-	s=g_strconcat(name,".png");
+	s=g_strconcat(name,".png",NULL);
 	filename=g_build_filename(prefix?prefix:"/usr",
 	  "share/icons/hicolor/24x24",type,s,NULL);
 	plover_install_icon_at_size(name,icon_set,GTK_ICON_SIZE_MENU,