diff --git a/libavcodec/lpc.c b/libavcodec/lpc.c
index 2093e7e802..bada368580 100644
--- a/libavcodec/lpc.c
+++ b/libavcodec/lpc.c
@@ -203,7 +203,7 @@ int ff_lpc_calc_coefs(LPCContext *s,
         double var[MAX_LPC_ORDER+1], av_uninit(weight);
 
         for(pass=0; pass<lpc_passes; pass++){
-            av_init_lls(&m[pass&1], max_order);
+            avpriv_init_lls(&m[pass&1], max_order);
 
             weight=0;
             for(i=max_order; i<blocksize; i++){
@@ -212,7 +212,7 @@ int ff_lpc_calc_coefs(LPCContext *s,
 
                 if(pass){
                     double eval, inv, rinv;
-                    eval= av_evaluate_lls(&m[(pass-1)&1], var+1, max_order-1);
+                    eval= avpriv_evaluate_lls(&m[(pass-1)&1], var+1, max_order-1);
                     eval= (512>>pass) + fabs(eval - var[0]);
                     inv = 1/eval;
                     rinv = sqrt(inv);
@@ -222,9 +222,9 @@ int ff_lpc_calc_coefs(LPCContext *s,
                 }else
                     weight++;
 
-                av_update_lls(&m[pass&1], var, 1.0);
+                avpriv_update_lls(&m[pass&1], var, 1.0);
             }
-            av_solve_lls(&m[pass&1], 0.001, 0);
+            avpriv_solve_lls(&m[pass&1], 0.001, 0);
         }
 
         for(i=0; i<max_order; i++){
diff --git a/libavutil/lls.c b/libavutil/lls.c
index b29fc968da..645e528744 100644
--- a/libavutil/lls.c
+++ b/libavutil/lls.c
@@ -30,13 +30,13 @@
 
 #include "lls.h"
 
-void av_init_lls(LLSModel *m, int indep_count)
+void avpriv_init_lls(LLSModel *m, int indep_count)
 {
     memset(m, 0, sizeof(LLSModel));
     m->indep_count = indep_count;
 }
 
-void av_update_lls(LLSModel *m, double *var, double decay)
+void avpriv_update_lls(LLSModel *m, double *var, double decay)
 {
     int i, j;
 
@@ -48,7 +48,7 @@ void av_update_lls(LLSModel *m, double *var, double decay)
     }
 }
 
-void av_solve_lls(LLSModel *m, double threshold, int min_order)
+void avpriv_solve_lls(LLSModel *m, double threshold, int min_order)
 {
     int i, j, k;
     double (*factor)[MAX_VARS + 1] = (void *) &m->covariance[1][0];
@@ -105,7 +105,7 @@ void av_solve_lls(LLSModel *m, double threshold, int min_order)
     }
 }
 
-double av_evaluate_lls(LLSModel *m, double *param, int order)
+double avpriv_evaluate_lls(LLSModel *m, double *param, int order)
 {
     int i;
     double out = 0;
@@ -116,6 +116,25 @@ double av_evaluate_lls(LLSModel *m, double *param, int order)
     return out;
 }
 
+#ifndef FF_API_LLS_PRIVATE
+void av_init_lls(LLSModel *m, int indep_count)
+{
+    return avpriv_init_lls(m, indep_count);
+}
+void av_update_lls(LLSModel *m, double *param, double decay)
+{
+    return avpriv_update_lls(m, param, decay);
+}
+void av_solve_lls(LLSModel *m, double threshold, int min_order)
+{
+    return avpriv_solve_lls(m, threshold, min_order);
+}
+double av_evaluate_lls(LLSModel *m, double *param, int order)
+{
+    return avpriv_evaluate_lls(m, param, order);
+}
+#endif
+
 #ifdef TEST
 
 #include <stdio.h>
@@ -129,7 +148,7 @@ int main(void)
     AVLFG lfg;
 
     av_lfg_init(&lfg, 1);
-    av_init_lls(&m, 3);
+    avpriv_init_lls(&m, 3);
 
     for (i = 0; i < 100; i++) {
         double var[4];
@@ -139,10 +158,10 @@ int main(void)
         var[1] = var[0] + av_lfg_get(&lfg) / (double) UINT_MAX - 0.5;
         var[2] = var[1] + av_lfg_get(&lfg) / (double) UINT_MAX - 0.5;
         var[3] = var[2] + av_lfg_get(&lfg) / (double) UINT_MAX - 0.5;
-        av_update_lls(&m, var, 0.99);
-        av_solve_lls(&m, 0.001, 0);
+        avpriv_update_lls(&m, var, 0.99);
+        avpriv_solve_lls(&m, 0.001, 0);
         for (order = 0; order < 3; order++) {
-            eval = av_evaluate_lls(&m, var + 1, order);
+            eval = avpriv_evaluate_lls(&m, var + 1, order);
             printf("real:%9f order:%d pred:%9f var:%f coeffs:%f %9f %9f\n",
                    var[0], order, eval, sqrt(m.variance[order] / (i + 1)),
                    m.coeff[order][0], m.coeff[order][1],
diff --git a/libavutil/lls.h b/libavutil/lls.h
index 5c51b7446f..4b197985a8 100644
--- a/libavutil/lls.h
+++ b/libavutil/lls.h
@@ -37,9 +37,15 @@ typedef struct LLSModel {
     int indep_count;
 } LLSModel;
 
+void avpriv_init_lls(LLSModel *m, int indep_count);
+void avpriv_update_lls(LLSModel *m, double *param, double decay);
+void avpriv_solve_lls(LLSModel *m, double threshold, int min_order);
+double avpriv_evaluate_lls(LLSModel *m, double *param, int order);
+
+#ifndef FF_API_LLS_PRIVATE
 void av_init_lls(LLSModel *m, int indep_count);
 void av_update_lls(LLSModel *m, double *param, double decay);
 void av_solve_lls(LLSModel *m, double threshold, int min_order);
 double av_evaluate_lls(LLSModel *m, double *param, int order);
-
+#endif
 #endif /* AVUTIL_LLS_H */
diff --git a/libavutil/version.h b/libavutil/version.h
index a23fdd2e47..8d7e378994 100644
--- a/libavutil/version.h
+++ b/libavutil/version.h
@@ -79,6 +79,10 @@
 #ifndef FF_API_CPU_FLAG_MMX2
 #define FF_API_CPU_FLAG_MMX2            (LIBAVUTIL_VERSION_MAJOR < 53)
 #endif
+#ifndef FF_API_LLS_PRIVATE
+#define FF_API_LLS_PRIVATE              (LIBAVUTIL_VERSION_MAJOR < 53)
+#endif
+
 
 /**
  * @}