diff --git a/clutter/clutter-bezier.c b/clutter/clutter-bezier.c
index d21ca3e64..3c2f827a4 100644
--- a/clutter/clutter-bezier.c
+++ b/clutter/clutter-bezier.c
@@ -96,7 +96,7 @@ struct _ClutterBezier
 };
 
 ClutterBezier *
-_clutter_bezier_new ()
+_clutter_bezier_new (void)
 {
   return g_slice_new0 (ClutterBezier);
 }
diff --git a/clutter/cogl/cogl/cogl-context.c b/clutter/cogl/cogl/cogl-context.c
index 871f6dd65..8d678f428 100644
--- a/clutter/cogl/cogl/cogl-context.c
+++ b/clutter/cogl/cogl/cogl-context.c
@@ -167,7 +167,7 @@ cogl_create_context (void)
 }
 
 void
-_cogl_destroy_context ()
+_cogl_destroy_context (void)
 {
 
   if (_context == NULL)
@@ -217,7 +217,7 @@ _cogl_destroy_context ()
 }
 
 CoglContext *
-_cogl_context_get_default ()
+_cogl_context_get_default (void)
 {
   /* Create if doesn't exist yet */
   if (_context == NULL)
diff --git a/tests/interactive/test-cogl-primitives.c b/tests/interactive/test-cogl-primitives.c
index fb5adb378..207c8e356 100644
--- a/tests/interactive/test-cogl-primitives.c
+++ b/tests/interactive/test-cogl-primitives.c
@@ -8,25 +8,25 @@
 typedef void (*PaintFunc) (void);
 
 static void
-test_paint_line ()
+test_paint_line (void)
 {
   cogl_path_line (-50, -25, 50, 25);
 }
 
 static void
-test_paint_rect ()
+test_paint_rect (void)
 {
   cogl_path_rectangle (-50, -25, 50, 25);
 }
 
 static void
-test_paint_rndrect()
+test_paint_rndrect(void)
 {
   cogl_path_round_rectangle (-50, -25, 50, 25, 10, 5);
 }
 
 static void
-test_paint_polyl ()
+test_paint_polyl (void)
 {
   gfloat poly_coords[] = {
     -50, -50,
@@ -39,7 +39,7 @@ test_paint_polyl ()
 }
 
 static void
-test_paint_polyg ()
+test_paint_polyg (void)
 {
   gfloat poly_coords[] = {
     -50, -50,
@@ -52,13 +52,13 @@ test_paint_polyg ()
 }
 
 static void
-test_paint_elp ()
+test_paint_elp (void)
 {
   cogl_path_ellipse (0, 0, 60, 40);
 }
 
 static void
-test_paint_curve ()
+test_paint_curve (void)
 {
   cogl_path_move_to (-50, +50);
 
diff --git a/tests/interactive/test-project.c b/tests/interactive/test-project.c
index f61fff4bf..29bc047e6 100644
--- a/tests/interactive/test-project.c
+++ b/tests/interactive/test-project.c
@@ -6,7 +6,7 @@
 static ClutterActor *main_stage, *rect, *p[5];
 
 static void
-init_handles ()
+init_handles (void)
 {
   gint              i;
   ClutterVertex    v[4];
@@ -49,7 +49,7 @@ init_handles ()
 }
 
 static void
-place_handles ()
+place_handles (void)
 {
   gint              i;
   ClutterVertex    v[4];
diff --git a/tests/micro-bench/test-text-perf.c b/tests/micro-bench/test-text-perf.c
index 2be7f27fd..f21cdc30b 100644
--- a/tests/micro-bench/test-text-perf.c
+++ b/tests/micro-bench/test-text-perf.c
@@ -44,7 +44,7 @@ queue_redraw (gpointer stage)
 }
 
 static ClutterActor *
-create_label ()
+create_label (void)
 {
   ClutterColor label_color = { 0xff, 0xff, 0xff, 0xff };
   ClutterActor *label;