diff --git a/ext/mimic/gstmimdec.h b/ext/mimic/gstmimdec.h
index fa67425eff..0a817bc689 100644
--- a/ext/mimic/gstmimdec.h
+++ b/ext/mimic/gstmimdec.h
@@ -33,7 +33,7 @@ G_BEGIN_DECLS
 #define GST_MIM_DEC(obj) \
   (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_MIM_DEC,GstMimDec))
 #define GST_MIM_DEC_CLASS(klass) \
-  (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_MIM_DEC,GstMimDec))
+  (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_MIM_DEC,GstMimDecClass))
 #define GST_IS_MIM_DEC(obj) \
   (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_MIM_DEC))
 #define GST_IS_MIM_DEC_CLASS(obj) \
diff --git a/ext/mimic/gstmimenc.h b/ext/mimic/gstmimenc.h
index 0196610afe..26ad42d63e 100644
--- a/ext/mimic/gstmimenc.h
+++ b/ext/mimic/gstmimenc.h
@@ -33,7 +33,7 @@ G_BEGIN_DECLS
 #define GST_MIM_ENC(obj) \
   (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_MIM_ENC,GstMimEnc))
 #define GST_MIM_ENC_CLASS(klass) \
-  (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_MIM_ENC,GstMimEnc))
+  (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_MIM_ENC,GstMimEncClass))
 #define GST_IS_MIM_ENC(obj) \
   (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_MIM_ENC))
 #define GST_IS_MIM_ENC_CLASS(obj) \