diff --git a/cogl/cogl-buffer.c b/cogl/cogl-buffer.c
index 23cd15a58..f5a0fc54e 100644
--- a/cogl/cogl-buffer.c
+++ b/cogl/cogl-buffer.c
@@ -85,7 +85,7 @@ _cogl_buffer_register_buffer_type (const CoglObjectClass *klass)
 }
 
 gboolean
-cogl_is_buffer (const void *object)
+cogl_is_buffer (void *object)
 {
   const CoglHandleObject *obj = object;
   GSList *l;
diff --git a/cogl/cogl-buffer.h b/cogl/cogl-buffer.h
index c1fceca46..ffd896855 100644
--- a/cogl/cogl-buffer.h
+++ b/cogl/cogl-buffer.h
@@ -75,7 +75,7 @@ typedef struct _CoglBuffer CoglBuffer;
  * Stability: unstable
  */
 gboolean
-cogl_is_buffer (const void *object);
+cogl_is_buffer (void *object);
 
 /**
  * cogl_buffer_get_size: