diff --git a/libavfilter/vf_eq.c b/libavfilter/vf_eq.c
index 7bbbaee2c5..ad2a37ea6e 100644
--- a/libavfilter/vf_eq.c
+++ b/libavfilter/vf_eq.c
@@ -65,7 +65,7 @@ static void create_lut(EQParameters *param)
 }
 
 static void apply_lut(EQParameters *param, uint8_t *dst, int dst_stride,
-                      uint8_t *src, int src_stride, int w, int h)
+                      const uint8_t *src, int src_stride, int w, int h)
 {
     int x, y;
 
@@ -80,7 +80,7 @@ static void apply_lut(EQParameters *param, uint8_t *dst, int dst_stride,
 }
 
 static void process_c(EQParameters *param, uint8_t *dst, int dst_stride,
-                      uint8_t *src, int src_stride, int w, int h)
+                      const uint8_t *src, int src_stride, int w, int h)
 {
     int x, y, pel;
 
diff --git a/libavfilter/vf_eq.h b/libavfilter/vf_eq.h
index 19995aa1f9..7e7c054261 100644
--- a/libavfilter/vf_eq.h
+++ b/libavfilter/vf_eq.h
@@ -29,7 +29,7 @@
 
 typedef struct EQParameters {
     void (*adjust)(struct EQParameters *eq, uint8_t *dst, int dst_stride,
-                   uint8_t *src, int src_stride, int w, int h);
+                   const uint8_t *src, int src_stride, int w, int h);
 
     uint8_t lut[256];
 
@@ -51,7 +51,7 @@ typedef struct {
     double gamma_r, gamma_g, gamma_b;
 
     void (*process)(struct EQParameters *par, uint8_t *dst, int dst_stride,
-                    uint8_t *src, int src_stride, int w, int h);
+                    const uint8_t *src, int src_stride, int w, int h);
 
 } EQContext;
 
diff --git a/libavfilter/x86/vf_eq.c b/libavfilter/x86/vf_eq.c
index 2e42cdf5ba..16f399505f 100644
--- a/libavfilter/x86/vf_eq.c
+++ b/libavfilter/x86/vf_eq.c
@@ -27,7 +27,7 @@
 
 #if HAVE_MMX_INLINE && HAVE_6REGS
 static void process_MMX(EQParameters *param, uint8_t *dst, int dst_stride,
-                        uint8_t *src, int src_stride, int w, int h)
+                        const uint8_t *src, int src_stride, int w, int h)
 {
         int i;
         int pel;