diff --git a/libavcodec/dsputil.c b/libavcodec/dsputil.c
index b56af0ea24..da24fe4fcd 100644
--- a/libavcodec/dsputil.c
+++ b/libavcodec/dsputil.c
@@ -797,7 +797,7 @@ static inline void avg_tpel_pixels_mc22_c(uint8_t *dst, const uint8_t *src, int
 
 #define QPEL_MC(r, OPNAME, RND, OP) \
 static void OPNAME ## mpeg4_qpel8_h_lowpass(uint8_t *dst, uint8_t *src, int dstStride, int srcStride, int h){\
-    uint8_t *cm = ff_cropTbl + MAX_NEG_CROP;\
+    const uint8_t *cm = ff_cropTbl + MAX_NEG_CROP;\
     int i;\
     for(i=0; i<h; i++)\
     {\
@@ -816,7 +816,7 @@ static void OPNAME ## mpeg4_qpel8_h_lowpass(uint8_t *dst, uint8_t *src, int dstS
 \
 static void OPNAME ## mpeg4_qpel8_v_lowpass(uint8_t *dst, uint8_t *src, int dstStride, int srcStride){\
     const int w=8;\
-    uint8_t *cm = ff_cropTbl + MAX_NEG_CROP;\
+    const uint8_t *cm = ff_cropTbl + MAX_NEG_CROP;\
     int i;\
     for(i=0; i<w; i++)\
     {\
@@ -843,7 +843,7 @@ static void OPNAME ## mpeg4_qpel8_v_lowpass(uint8_t *dst, uint8_t *src, int dstS
 }\
 \
 static void OPNAME ## mpeg4_qpel16_h_lowpass(uint8_t *dst, uint8_t *src, int dstStride, int srcStride, int h){\
-    uint8_t *cm = ff_cropTbl + MAX_NEG_CROP;\
+    const uint8_t *cm = ff_cropTbl + MAX_NEG_CROP;\
     int i;\
     \
     for(i=0; i<h; i++)\
@@ -870,7 +870,7 @@ static void OPNAME ## mpeg4_qpel16_h_lowpass(uint8_t *dst, uint8_t *src, int dst
 }\
 \
 static void OPNAME ## mpeg4_qpel16_v_lowpass(uint8_t *dst, uint8_t *src, int dstStride, int srcStride){\
-    uint8_t *cm = ff_cropTbl + MAX_NEG_CROP;\
+    const uint8_t *cm = ff_cropTbl + MAX_NEG_CROP;\
     int i;\
     const int w=16;\
     for(i=0; i<w; i++)\
@@ -1352,7 +1352,7 @@ void ff_avg_pixels16x16_c(uint8_t *dst, uint8_t *src, ptrdiff_t stride)
 #define put_no_rnd_qpel16_mc00_c ff_put_pixels16x16_c
 
 static void wmv2_mspel8_h_lowpass(uint8_t *dst, uint8_t *src, int dstStride, int srcStride, int h){
-    uint8_t *cm = ff_cropTbl + MAX_NEG_CROP;
+    const uint8_t *cm = ff_cropTbl + MAX_NEG_CROP;
     int i;
 
     for(i=0; i<h; i++){
@@ -1434,7 +1434,7 @@ DIRAC_MC(avg)
 #endif
 
 static void wmv2_mspel8_v_lowpass(uint8_t *dst, uint8_t *src, int dstStride, int srcStride, int w){
-    uint8_t *cm = ff_cropTbl + MAX_NEG_CROP;
+    const uint8_t *cm = ff_cropTbl + MAX_NEG_CROP;
     int i;
 
     for(i=0; i<w; i++){