diff --git a/gst/Makefile.am b/gst/Makefile.am
index 1a63b82ba1..ceb4790ef8 100644
--- a/gst/Makefile.am
+++ b/gst/Makefile.am
@@ -129,14 +129,14 @@ cothreads.o: $(srcdir)/cothreads.c $(srcdir)/cothreads.h $(srcdir)/gst_private.h
 
 # Generate both marshal files together.  Makes dependency work easier.
 gstmarshal.h: gstmarshal.list
-	glib-genmarshal --header --prefix=gst gstmarshal.list > gstmarshal.h
+	glib-genmarshal --header --prefix=gst_marshal gstmarshal.list > gstmarshal.h
 	echo "#include \"glib-object.h\"" >gstmarshal.c
-	glib-genmarshal --body --prefix=gst gstmarshal.list >> gstmarshal.c
+	glib-genmarshal --body --prefix=gst_marshal gstmarshal.list >> gstmarshal.c
 
 gstmarshal.c: gstmarshal.list
-	glib-genmarshal --header --prefix=gst gstmarshal.list > gstmarshal.h
+	glib-genmarshal --header --prefix=gst_marshal gstmarshal.list > gstmarshal.h
 	echo "#include \"glib-object.h\"" >gstmarshal.c
-	glib-genmarshal --body --prefix=gst gstmarshal.list >> gstmarshal.c
+	glib-genmarshal --body --prefix=gst_marshal gstmarshal.list >> gstmarshal.c
 
 ##### end built sources #####