diff --git a/src/gallium/drivers/radeonsi/si_pipe.c b/src/gallium/drivers/radeonsi/si_pipe.c
index 473a2e9..e454ed0 100644
--- a/src/gallium/drivers/radeonsi/si_pipe.c
+++ b/src/gallium/drivers/radeonsi/si_pipe.c
@@ -295,7 +295,7 @@ static int si_get_param(struct pipe_screen* pscreen, enum pipe_cap param)

 	case PIPE_CAP_CONSTANT_BUFFER_OFFSET_ALIGNMENT:
 	case PIPE_CAP_TEXTURE_BUFFER_OFFSET_ALIGNMENT:
-		return 4;
+		return 256;

 	case PIPE_CAP_GLSL_FEATURE_LEVEL:
 		return HAVE_LLVM >= 0x0307 ? 410 : 330;