diff --git a/sys/src/swscale/scale.rs b/sys/src/swscale/scale.rs
index d69534c..707dcec 100644
--- a/sys/src/swscale/scale.rs
+++ b/sys/src/swscale/scale.rs
@@ -1,27 +1,27 @@
 use libc::{c_void, c_char, c_int, c_uint, c_float, c_double, uint8_t};
 use ::avutil::{AVPixelFormat, AVClass};
 
-pub const SWS_FAST_BILINEAR:        c_uint = 1;
-pub const SWS_BILINEAR:             c_uint = 2;
-pub const SWS_BICUBIC:              c_uint = 4;
-pub const SWS_X:                    c_uint = 8;
-pub const SWS_POINT:                c_uint = 0x10;
-pub const SWS_AREA:                 c_uint = 0x20;
-pub const SWS_BICUBLIN:             c_uint = 0x40;
-pub const SWS_GAUSS:                c_uint = 0x80;
-pub const SWS_SINC:                 c_uint = 0x100;
-pub const SWS_LANCZOS:              c_uint = 0x200;
-pub const SWS_SPLINE:               c_uint = 0x400;
-pub const SWS_SRC_V_CHR_DROP_MASK:  c_uint = 0x30000;
-pub const SWS_SRC_V_CHR_DROP_SHIFT: c_uint = 16;
-pub const SWS_PARAM_DEFAULT:        c_uint = 123456;
-pub const SWS_PRINT_INFO:           c_uint = 0x1000;
-pub const SWS_FULL_CHR_H_INT:       c_uint = 0x2000;
-pub const SWS_FULL_CHR_H_INP:       c_uint = 0x4000;
-pub const SWS_DIRECT_BGR:           c_uint = 0x8000;
-pub const SWS_ACCURATE_RND:         c_uint = 0x40000;
-pub const SWS_BITEXACT:             c_uint = 0x80000;
-pub const SWS_ERROR_DIFFUSION:      c_uint = 0x800000;
+pub const SWS_FAST_BILINEAR:        c_int = 1;
+pub const SWS_BILINEAR:             c_int = 2;
+pub const SWS_BICUBIC:              c_int = 4;
+pub const SWS_X:                    c_int = 8;
+pub const SWS_POINT:                c_int = 0x10;
+pub const SWS_AREA:                 c_int = 0x20;
+pub const SWS_BICUBLIN:             c_int = 0x40;
+pub const SWS_GAUSS:                c_int = 0x80;
+pub const SWS_SINC:                 c_int = 0x100;
+pub const SWS_LANCZOS:              c_int = 0x200;
+pub const SWS_SPLINE:               c_int = 0x400;
+pub const SWS_SRC_V_CHR_DROP_MASK:  c_int = 0x30000;
+pub const SWS_SRC_V_CHR_DROP_SHIFT: c_int = 16;
+pub const SWS_PARAM_DEFAULT:        c_int = 123456;
+pub const SWS_PRINT_INFO:           c_int = 0x1000;
+pub const SWS_FULL_CHR_H_INT:       c_int = 0x2000;
+pub const SWS_FULL_CHR_H_INP:       c_int = 0x4000;
+pub const SWS_DIRECT_BGR:           c_int = 0x8000;
+pub const SWS_ACCURATE_RND:         c_int = 0x40000;
+pub const SWS_BITEXACT:             c_int = 0x80000;
+pub const SWS_ERROR_DIFFUSION:      c_int = 0x800000;
 
 pub const SWS_CPU_CAPS_MMX:     c_uint = 0x80000000;
 pub const SWS_CPU_CAPS_MMXEXT:  c_uint = 0x20000000;