diff --git a/src/libImaging/Convert.c b/src/libImaging/Convert.c
index 038a83fe5c3..5df48fb23fe 100644
--- a/src/libImaging/Convert.c
+++ b/src/libImaging/Convert.c
@@ -1041,7 +1041,7 @@ static void
 p2i(UINT8* out_, const UINT8* in, int xsize, const UINT8* palette)
 {
     int x;
-    for (x = 0; x < xsize; x++, in += 2, out_ += 4) {
+    for (x = 0; x < xsize; x++, out_ += 4) {
         INT32 v = L(&palette[in[x]*4]) / 1000;
         memcpy(out_, &v, sizeof(v));
     }
@@ -1060,7 +1060,7 @@ static void
 p2f(UINT8* out_, const UINT8* in, int xsize, const UINT8* palette)
 {
     int x;
-    for (x = 0; x < xsize; x++, in += 2, out_ += 4) {
+    for (x = 0; x < xsize; x++, out_ += 4) {
         FLOAT32 v = L(&palette[in[x]*4]) / 1000.0F;
         memcpy(out_, &v, sizeof(v));
     }