diff --git a/libavutil/fifo.c b/libavutil/fifo.c
index 26a81657d9..57b229a4c4 100644
--- a/libavutil/fifo.c
+++ b/libavutil/fifo.c
@@ -48,12 +48,6 @@ int av_fifo_size(AVFifoBuffer *f)
     return (uint32_t)(f->wndx - f->rndx);
 }
 
-#if LIBAVUTIL_VERSION_MAJOR < 50
-void av_fifo_realloc(AVFifoBuffer *f, unsigned int new_size) {
-    av_fifo_realloc2(f, new_size);
-}
-#endif
-
 int av_fifo_realloc2(AVFifoBuffer *f, unsigned int new_size) {
     unsigned int old_size= f->end - f->buffer;
 
@@ -73,13 +67,6 @@ int av_fifo_realloc2(AVFifoBuffer *f, unsigned int new_size) {
     return 0;
 }
 
-#if LIBAVUTIL_VERSION_MAJOR < 50
-void av_fifo_write(AVFifoBuffer *f, const uint8_t *buf, int size)
-{
-    av_fifo_generic_write(f, (void *)buf, size, NULL);
-}
-#endif
-
 int av_fifo_generic_write(AVFifoBuffer *f, void *src, int size, int (*func)(void*, void*, int))
 {
     int total = size;
diff --git a/libavutil/fifo.h b/libavutil/fifo.h
index d1949044ff..9ba7e700fc 100644
--- a/libavutil/fifo.h
+++ b/libavutil/fifo.h
@@ -64,16 +64,6 @@ int av_fifo_size(AVFifoBuffer *f);
  */
 int av_fifo_generic_read(AVFifoBuffer *f, int buf_size, void (*func)(void*, void*, int), void* dest);
 
-#if LIBAVUTIL_VERSION_MAJOR < 50
-/**
- * Writes data into an AVFifoBuffer.
- * @param *f AVFifoBuffer to write to
- * @param *buf data source
- * @param size data size
- */
-attribute_deprecated void av_fifo_write(AVFifoBuffer *f, const uint8_t *buf, int size);
-#endif
-
 /**
  * Feeds data from a user-supplied callback to an AVFifoBuffer.
  * @param *f AVFifoBuffer to write to
@@ -88,16 +78,6 @@ attribute_deprecated void av_fifo_write(AVFifoBuffer *f, const uint8_t *buf, int
  */
 int av_fifo_generic_write(AVFifoBuffer *f, void *src, int size, int (*func)(void*, void*, int));
 
-#if LIBAVUTIL_VERSION_MAJOR < 50
-/**
- * Resizes an AVFifoBuffer.
- * @param *f AVFifoBuffer to resize
- * @param size new AVFifoBuffer size in bytes
- * @see av_fifo_realloc2()
- */
-attribute_deprecated void av_fifo_realloc(AVFifoBuffer *f, unsigned int size);
-#endif
-
 /**
  * Resizes an AVFifoBuffer.
  * @param *f AVFifoBuffer to resize
diff --git a/libavutil/lzo.c b/libavutil/lzo.c
index 83fa9bfbaf..686983a506 100644
--- a/libavutil/lzo.c
+++ b/libavutil/lzo.c
@@ -234,12 +234,6 @@ int av_lzo1x_decode(void *out, int *outlen, const void *in, int *inlen) {
     return c.error;
 }
 
-#if LIBAVUTIL_VERSION_MAJOR < 50
-int lzo1x_decode(void *out, int *outlen, const void *in, int *inlen) {
-    return av_lzo1x_decode(out, outlen, in, inlen);
-}
-#endif
-
 #ifdef TEST
 #include <stdio.h>
 #include <lzo/lzo1x.h>
diff --git a/libavutil/rc4.c b/libavutil/rc4.c
index e6e7dc9e1a..4e52ba5ac1 100644
--- a/libavutil/rc4.c
+++ b/libavutil/rc4.c
@@ -59,11 +59,3 @@ void av_rc4_crypt(AVRC4 *r, uint8_t *dst, const uint8_t *src, int count, uint8_t
     }
     r->x = x; r->y = y;
 }
-
-#if LIBAVUTIL_VERSION_MAJOR < 50
-void ff_rc4_enc(const uint8_t *key, int keylen, uint8_t *data, int datalen) {
-    AVRC4 r;
-    av_rc4_init(&r, key, keylen * 8, 0);
-    av_rc4_crypt(&r, data, data, datalen, NULL, 0);
-}
-#endif