diff --git a/libavcodec/lagarith.c b/libavcodec/lagarith.c
index 71b5bd950f..3a47f4c632 100644
--- a/libavcodec/lagarith.c
+++ b/libavcodec/lagarith.c
@@ -382,7 +382,7 @@ static int lag_decode_arith_plane(LagarithContext *l, uint8_t *dst,
         if (lag_read_prob_header(&rac, &gb) < 0)
             return -1;
 
-        lag_rac_init(&rac, &gb, length - stride);
+        ff_lag_rac_init(&rac, &gb, length - stride);
 
         for (i = 0; i < height; i++)
             read += lag_decode_line(l, &rac, dst + (i * stride), width,
diff --git a/libavcodec/lagarithrac.c b/libavcodec/lagarithrac.c
index ab7a60011d..33dc6e4bd4 100644
--- a/libavcodec/lagarithrac.c
+++ b/libavcodec/lagarithrac.c
@@ -30,7 +30,7 @@
 #include "get_bits.h"
 #include "lagarithrac.h"
 
-void lag_rac_init(lag_rac *l, GetBitContext *gb, int length)
+void ff_lag_rac_init(lag_rac *l, GetBitContext *gb, int length)
 {
     int i, j;
 
diff --git a/libavcodec/lagarithrac.h b/libavcodec/lagarithrac.h
index b9421993a4..aa36d38f85 100644
--- a/libavcodec/lagarithrac.h
+++ b/libavcodec/lagarithrac.h
@@ -51,7 +51,7 @@ typedef struct lag_rac {
     uint8_t  range_hash[256];   /**< Hash table mapping upper byte to approximate symbol. */
 } lag_rac;
 
-void lag_rac_init(lag_rac *l, GetBitContext *gb, int length);
+void ff_lag_rac_init(lag_rac *l, GetBitContext *gb, int length);
 
 /* TODO: Optimize */
 static inline void lag_rac_refill(lag_rac *l)