diff --git a/libavcodec/bmp.c b/libavcodec/bmp.c
index e8e007299f..9aee3756f1 100644
--- a/libavcodec/bmp.c
+++ b/libavcodec/bmp.c
@@ -257,7 +257,7 @@ static int bmp_decode_frame(AVCodecContext *avctx,
         buf = buf0 + 14 + ihsize; //palette location
         if((hsize-ihsize-14) < (colors << 2)){ // OS/2 bitmap, 3 bytes per palette entry
             for(i = 0; i < colors; i++)
-                ((uint32_t*)p->data[1])[i] = (0xff<<24) | bytestream_get_le24(&buf);
+                ((uint32_t*)p->data[1])[i] = (0xFFU<<24) | bytestream_get_le24(&buf);
         }else{
             for(i = 0; i < colors; i++)
                 ((uint32_t*)p->data[1])[i] = 0xFFU << 24 | bytestream_get_le32(&buf);
diff --git a/libavcodec/msrle.c b/libavcodec/msrle.c
index 0e8a0e539d..2792f8b004 100644
--- a/libavcodec/msrle.c
+++ b/libavcodec/msrle.c
@@ -75,7 +75,7 @@ static av_cold int msrle_decode_init(AVCodecContext *avctx)
 
     if (avctx->extradata_size >= AVPALETTE_SIZE)
         for (i = 0; i < AVPALETTE_SIZE/4; i++)
-            s->pal[i] = 0xFF<<24 | AV_RL32(avctx->extradata+4*i);
+            s->pal[i] = 0xFFU<<24 | AV_RL32(avctx->extradata+4*i);
 
     return 0;
 }
diff --git a/libavcodec/sunrast.c b/libavcodec/sunrast.c
index f20e6820be..eb245dab1a 100644
--- a/libavcodec/sunrast.c
+++ b/libavcodec/sunrast.c
@@ -141,7 +141,7 @@ static int sunrast_decode_frame(AVCodecContext *avctx, void *data,
 
         ptr = p->data[1];
         for (x = 0; x < len; x++, ptr += 4)
-            *(uint32_t *)ptr = (0xFF<<24) + (buf[x]<<16) + (buf[len+x]<<8) + buf[len+len+x];
+            *(uint32_t *)ptr = (0xFFU<<24) + (buf[x]<<16) + (buf[len+x]<<8) + buf[len+len+x];
     }
 
     buf += maplength;
diff --git a/libavformat/avidec.c b/libavformat/avidec.c
index 835c36d4e4..9285229dcb 100644
--- a/libavformat/avidec.c
+++ b/libavformat/avidec.c
@@ -626,7 +626,7 @@ static int avi_read_header(AVFormatContext *s)
                         pal_size = FFMIN(pal_size, st->codec->extradata_size);
                         pal_src = st->codec->extradata + st->codec->extradata_size - pal_size;
                         for (i = 0; i < pal_size/4; i++)
-                            ast->pal[i] = 0xFF<<24 | AV_RL32(pal_src+4*i);
+                            ast->pal[i] = 0xFFU<<24 | AV_RL32(pal_src+4*i);
                         ast->has_pal = 1;
                     }
 
@@ -1009,7 +1009,7 @@ start_sync:
                 avio_rl16(pb); //flags
 
                 for (; k <= last; k++)
-                    ast->pal[k] = 0xFF<<24 | avio_rb32(pb)>>8;// b + (g << 8) + (r << 16);
+                    ast->pal[k] = 0xFFU<<24 | avio_rb32(pb)>>8;// b + (g << 8) + (r << 16);
                 ast->has_pal= 1;
                 goto start_sync;
             } else if(   ((ast->prefix_count<5 || sync+9 > i) && d[2]<128 && d[3]<128) ||
diff --git a/libavutil/imgutils.c b/libavutil/imgutils.c
index 57ee07d32b..e4460d3cea 100644
--- a/libavutil/imgutils.c
+++ b/libavutil/imgutils.c
@@ -180,7 +180,7 @@ int ff_set_systematic_pal2(uint32_t pal[256], enum AVPixelFormat pix_fmt)
         default:
             return AVERROR(EINVAL);
         }
-        pal[i] = b + (g<<8) + (r<<16) + (0xFF<<24);
+        pal[i] = b + (g<<8) + (r<<16) + (0xFFU<<24);
     }
 
     return 0;