diff --git a/src/gallium/drivers/radeonsi/si_state_viewport.c b/src/gallium/drivers/radeonsi/si_state_viewport.c
index 64bb956b200..a9a1be73ba4 100644
--- a/src/gallium/drivers/radeonsi/si_state_viewport.c
+++ b/src/gallium/drivers/radeonsi/si_state_viewport.c
@@ -186,7 +186,7 @@ static void si_emit_guardband(struct si_context *ctx)
 		ctx->chip_class >= VI ? 16 : MAX2(ctx->screen->se_tile_repeat, 16);
 
 	/* Indexed by quantization modes */
-	static unsigned max_viewport_size[] = {65535, 16383, 4095};
+	static int max_viewport_size[] = {65535, 16383, 4095};
 
 	/* Ensure that the whole viewport stays representable in
 	 * absolute coordinates.