diff --git a/perf/Makefile.am b/perf/Makefile.am
index 9a35a17830..799b748eab 100644
--- a/perf/Makefile.am
+++ b/perf/Makefile.am
@@ -57,12 +57,12 @@ marshalers.h: stamp-marshalers.h
 	@true
 
 stamp-marshalers.h: @REBUILD@ marshalers.list
-	$(GLIB_GENMARSHAL) --prefix=_gtk_marshal $(srcdir)/marshalers.list --header >> xgen-gmlh \
+	$(GLIB_GENMARSHAL) --prefix=_testperf_marshal $(srcdir)/marshalers.list --header >> xgen-gmlh \
 	&& (cmp -s xgen-gmlh marshalers.h || cp xgen-gmlh marshalers.h) \
 	&& rm -f xgen-gmlh \
 	&& echo timestamp > $(@F)
 marshalers.c: @REBUILD@ marshalers.list
-	$(GLIB_GENMARSHAL) --prefix=_gtk_marshal $(srcdir)/marshalers.list --body >> xgen-gmlc \
+	$(GLIB_GENMARSHAL) --prefix=_testperf_marshal $(srcdir)/marshalers.list --body >> xgen-gmlc \
 	&& cp xgen-gmlc marshalers.c \
 	&& rm -f xgen-gmlc
 
diff --git a/perf/gtkwidgetprofiler.c b/perf/gtkwidgetprofiler.c
index 94b911acda..afbc53dd22 100644
--- a/perf/gtkwidgetprofiler.c
+++ b/perf/gtkwidgetprofiler.c
@@ -53,7 +53,7 @@ gtk_widget_profiler_class_init (GtkWidgetProfilerClass *class)
 		  G_SIGNAL_RUN_LAST,
 		  G_STRUCT_OFFSET (GtkWidgetProfilerClass, create_widget),
 		  NULL, NULL,
-		  _gtk_marshal_OBJECT__VOID,
+		  _testperf_marshal_OBJECT__VOID,
 		  G_TYPE_OBJECT, 0);
 
   signals[REPORT] =
@@ -62,7 +62,7 @@ gtk_widget_profiler_class_init (GtkWidgetProfilerClass *class)
 		  G_SIGNAL_RUN_FIRST,
 		  G_STRUCT_OFFSET (GtkWidgetProfilerClass, report),
 		  NULL, NULL,
-		  _gtk_marshal_VOID__ENUM_OBJECT_DOUBLE,
+		  _testperf_marshal_VOID__ENUM_OBJECT_DOUBLE,
 		  G_TYPE_NONE, 3,
 		  GTK_TYPE_WIDGET_PROFILER_REPORT,
 		  G_TYPE_OBJECT,