diff --git a/gst-libs/gst/video/gstvideodecoder.h b/gst-libs/gst/video/gstvideodecoder.h
index 34fa1137df..02e6753851 100644
--- a/gst-libs/gst/video/gstvideodecoder.h
+++ b/gst-libs/gst/video/gstvideodecoder.h
@@ -40,7 +40,7 @@ G_BEGIN_DECLS
   (G_TYPE_INSTANCE_GET_CLASS((obj),GST_TYPE_VIDEO_DECODER,GstVideoDecoderClass))
 #define GST_IS_VIDEO_DECODER(obj) \
   (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_VIDEO_DECODER))
-#define GST_IS_VIDEO_DECODER_CLASS(obj) \
+#define GST_IS_VIDEO_DECODER_CLASS(klass) \
   (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_VIDEO_DECODER))
 #define GST_VIDEO_DECODER_CAST(obj) ((GstVideoDecoder *)(obj))
 
diff --git a/gst-libs/gst/video/gstvideoencoder.h b/gst-libs/gst/video/gstvideoencoder.h
index 171d3c96e1..9282b1c944 100644
--- a/gst-libs/gst/video/gstvideoencoder.h
+++ b/gst-libs/gst/video/gstvideoencoder.h
@@ -39,7 +39,7 @@ G_BEGIN_DECLS
   (G_TYPE_INSTANCE_GET_CLASS((obj),GST_TYPE_VIDEO_ENCODER,GstVideoEncoderClass))
 #define GST_IS_VIDEO_ENCODER(obj) \
   (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_VIDEO_ENCODER))
-#define GST_IS_VIDEO_ENCODER_CLASS(obj) \
+#define GST_IS_VIDEO_ENCODER_CLASS(klass) \
   (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_VIDEO_ENCODER))
 #define GST_VIDEO_ENCODER_CAST(enc) ((GstVideoEncoder*)enc)