diff --git a/stb_image.h b/stb_image.h
index d9c21bc..6ad965e 100644
--- a/stb_image.h
+++ b/stb_image.h
@@ -5030,7 +5030,7 @@ static int stbi__bitcount(unsigned int a)
 // extract an arbitrarily-aligned N-bit value (N=bits)
 // from v, and then make it 8-bits long and fractionally
 // extend it to full full range.
-static int stbi__shiftsigned(int v, int shift, int bits)
+static int stbi__shiftsigned(unsigned int v, int shift, int bits)
 {
    static unsigned int mul_table[9] = {
       0,