diff --git a/libavcodec/jpeg2000.c b/libavcodec/jpeg2000.c
index 5889f80576..51823e6cd7 100644
--- a/libavcodec/jpeg2000.c
+++ b/libavcodec/jpeg2000.c
@@ -115,7 +115,6 @@ static int getsigctxno(int flag, int bandno)
             return 2;
         if (d == 1)
             return 1;
-        return 0;
     } else {
         if (d >= 3)
             return 8;
@@ -135,7 +134,6 @@ static int getsigctxno(int flag, int bandno)
             return 2;
         if (h + v == 1)
             return 1;
-        return 0;
     }
     return 0;
 }
diff --git a/libavcodec/jpeg2000dec.c b/libavcodec/jpeg2000dec.c
index 86ccad0881..1b40912152 100644
--- a/libavcodec/jpeg2000dec.c
+++ b/libavcodec/jpeg2000dec.c
@@ -992,7 +992,6 @@ static void dequantization_float(int x, int y, Jpeg2000Cblk *cblk,
             idx        = (comp->coord[0][1] - comp->coord[0][0]) * j + i;
             datap[idx] = (float)(t1->data[j][i]) * ((float)band->stepsize);
         }
-    return;
 }
 
 /* Integer dequantization of a codeblock.*/
@@ -1009,7 +1008,6 @@ static void dequantization_int(int x, int y, Jpeg2000Cblk *cblk,
             datap[idx] =
                 ((int32_t)(t1->data[j][i]) * ((int32_t)band->stepsize) + (1 << 15)) >> 16;
         }
-    return;
 }
 
 /* Inverse ICT parameters in float and integer.
@@ -1027,10 +1025,9 @@ static const int   i_ict_params[4] = {
     116130
 };
 
-static int mct_decode(Jpeg2000DecoderContext *s, Jpeg2000Tile *tile)
+static void mct_decode(Jpeg2000DecoderContext *s, Jpeg2000Tile *tile)
 {
     int i, csize = 1;
-    int ret = 0;
     int32_t *src[3],  i0,  i1,  i2;
     float   *srcf[3], i0f, i1f, i2f;
 
@@ -1076,7 +1073,6 @@ static int mct_decode(Jpeg2000DecoderContext *s, Jpeg2000Tile *tile)
         }
         break;
     }
-    return ret;
 }
 
 static int jpeg2000_decode_tile(Jpeg2000DecoderContext *s, Jpeg2000Tile *tile,