diff --git a/libavutil/lls.c b/libavutil/lls.c
index 06fe4238ed..f77043bc4a 100644
--- a/libavutil/lls.c
+++ b/libavutil/lls.c
@@ -32,7 +32,7 @@
 #include "version.h"
 #include "lls.h"
 
-static void update_lls(LLSModel *m, double *var)
+static void update_lls(LLSModel *m, const double *var)
 {
     int i, j;
 
@@ -100,7 +100,7 @@ void avpriv_solve_lls(LLSModel *m, double threshold, unsigned short min_order)
     }
 }
 
-static double evaluate_lls(LLSModel *m, double *param, int order)
+static double evaluate_lls(LLSModel *m, const double *param, int order)
 {
     int i;
     double out = 0;
diff --git a/libavutil/lls.h b/libavutil/lls.h
index 46f96060d0..5635b5b2fd 100644
--- a/libavutil/lls.h
+++ b/libavutil/lls.h
@@ -47,14 +47,14 @@ typedef struct LLSModel {
      *            32-byte aligned, and any padding elements must be initialized
      *            (i.e not denormal/nan).
      */
-    void (*update_lls)(struct LLSModel *m, double *var);
+    void (*update_lls)(struct LLSModel *m, const double *var);
     /**
      * Inner product of var[] and the LPC coefs.
      * @param m this context
      * @param var training samples, excluding the value to be predicted. unaligned.
      * @param order lpc order
      */
-    double (*evaluate_lls)(struct LLSModel *m, double *var, int order);
+    double (*evaluate_lls)(struct LLSModel *m, const double *var, int order);
 } LLSModel;
 
 void avpriv_init_lls(LLSModel *m, int indep_count);
diff --git a/libavutil/x86/lls_init.c b/libavutil/x86/lls_init.c
index 181ca38dae..f53190488a 100644
--- a/libavutil/x86/lls_init.c
+++ b/libavutil/x86/lls_init.c
@@ -23,9 +23,9 @@
 #include "libavutil/lls.h"
 #include "libavutil/x86/cpu.h"
 
-void ff_update_lls_sse2(LLSModel *m, double *var);
-void ff_update_lls_avx(LLSModel *m, double *var);
-double ff_evaluate_lls_sse2(LLSModel *m, double *var, int order);
+void ff_update_lls_sse2(LLSModel *m, const double *var);
+void ff_update_lls_avx(LLSModel *m, const double *var);
+double ff_evaluate_lls_sse2(LLSModel *m, const double *var, int order);
 
 av_cold void ff_init_lls_x86(LLSModel *m)
 {