diff --git a/libavformat/avformat.h b/libavformat/avformat.h
index 7551f7b548..9a7672f9e0 100644
--- a/libavformat/avformat.h
+++ b/libavformat/avformat.h
@@ -393,9 +393,7 @@ typedef struct AVProbeData {
     const char *filename;
     unsigned char *buf; /**< Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero. */
     int buf_size;       /**< Size of buf except extra allocated bytes */
-#if FF_API_PROBE_MIME
     uint8_t *mime_type; /**< mime_type, when known. */
-#endif
 } AVProbeData;
 
 #define AVPROBE_SCORE_RETRY (AVPROBE_SCORE_MAX/4)
diff --git a/libavformat/format.c b/libavformat/format.c
index 1c25d6b933..999e8216da 100644
--- a/libavformat/format.c
+++ b/libavformat/format.c
@@ -216,10 +216,8 @@ AVInputFormat *av_probe_input_format3(AVProbeData *pd, int is_opened,
             if (av_match_ext(lpd.filename, fmt1->extensions))
                 score = AVPROBE_SCORE_EXTENSION;
         }
-#if FF_API_PROBE_MIME
         if (av_match_name(lpd.mime_type, fmt1->mime_type))
             score = FFMAX(score, AVPROBE_SCORE_EXTENSION);
-#endif
         if (score > score_max) {
             score_max = score;
             fmt       = fmt1;
@@ -272,10 +270,9 @@ int av_probe_input_buffer2(AVIOContext *pb, AVInputFormat **fmt,
     if (offset >= max_probe_size)
         return AVERROR(EINVAL);
 
-#if FF_API_PROBE_MIME
     if (pb->av_class)
         av_opt_get(pb, "mime_type", AV_OPT_SEARCH_CHILDREN, &pd.mime_type);
-#else
+#if 0
     if (!*fmt && pb->av_class && av_opt_get(pb, "mime_type", AV_OPT_SEARCH_CHILDREN, &mime_type) >= 0 && mime_type) {
         if (!av_strcasecmp(mime_type, "audio/aacp")) {
             *fmt = av_find_input_format("aac");
@@ -338,9 +335,7 @@ fail:
     if (ret >= 0)
         ret = ret2;
 
-#if FF_API_PROBE_MIME
     av_free(pd.mime_type);
-#endif
     return ret < 0 ? ret : score;
 }
 
diff --git a/libavformat/version.h b/libavformat/version.h
index c40c0c9819..9686a58ccc 100644
--- a/libavformat/version.h
+++ b/libavformat/version.h
@@ -88,8 +88,4 @@
 #ifndef FF_API_R_FRAME_RATE
 #define FF_API_R_FRAME_RATE            1
 #endif
-#ifndef FF_API_PROBE_MIME
-#define FF_API_PROBE_MIME               (LIBAVFORMAT_VERSION_MAJOR > 55)
-#endif
-
 #endif /* AVFORMAT_VERSION_H */