diff --git a/libavcodec/avcodec.h b/libavcodec/avcodec.h
index 223db9ca75..32a7dcb3ed 100644
--- a/libavcodec/avcodec.h
+++ b/libavcodec/avcodec.h
@@ -2620,7 +2620,9 @@ typedef struct AVCodecContext {
 #define FF_IDCT_INT           1
 #define FF_IDCT_SIMPLE        2
 #define FF_IDCT_SIMPLEMMX     3
+#if FF_API_LIBMPEG2
 #define FF_IDCT_LIBMPEG2MMX   4
+#endif
 #define FF_IDCT_MMI           5
 #define FF_IDCT_ARM           7
 #define FF_IDCT_ALTIVEC       8
diff --git a/libavcodec/version.h b/libavcodec/version.h
index 5b2d7b99f7..b97439c91c 100644
--- a/libavcodec/version.h
+++ b/libavcodec/version.h
@@ -85,5 +85,8 @@
 #ifndef FF_API_AVCODEC_RESAMPLE
 #define FF_API_AVCODEC_RESAMPLE  (LIBAVCODEC_VERSION_MAJOR < 55)
 #endif
+#ifndef FF_API_LIBMPEG2
+#define FF_API_LIBMPEG2          (LIBAVCODEC_VERSION_MAJOR < 55)
+#endif
 
 #endif /* AVCODEC_VERSION_H */