diff --git a/libswscale/ppc/yuv2rgb_altivec.c b/libswscale/ppc/yuv2rgb_altivec.c
index 536545293d..d435269dab 100644
--- a/libswscale/ppc/yuv2rgb_altivec.c
+++ b/libswscale/ppc/yuv2rgb_altivec.c
@@ -335,13 +335,13 @@ static int altivec_ ## name(SwsContext *c, const unsigned char **in,          \
         vec_dstst(oute, (0x02000002 | (((w * 3 + 32) / 32) << 16)), 1);       \
                                                                               \
         for (j = 0; j < w / 16; j++) {                                        \
-            y0 = vec_xl(0, y1i);                                              \
+            y0 = vec_xl((signed long long)0, y1i);                            \
                                                                               \
-            y1 = vec_xl(0, y2i);                                              \
+            y1 = vec_xl((signed long long)0, y2i);                            \
                                                                               \
-            u = (vector signed char) vec_xl(0, ui);                           \
+            u = (vector signed char) vec_xl((signed long long)0, ui);         \
                                                                               \
-            v = (vector signed char) vec_xl(0, vi);                           \
+            v = (vector signed char) vec_xl((signed long long)0, vi);         \
                                                                               \
             u = (vector signed char)                                          \
                     vec_sub(u,                                                \