diff --git a/src/gallium/drivers/r300/r300_screen.c b/src/gallium/drivers/r300/r300_screen.c
index 6c7f05d5860..ffcaf649141 100644
--- a/src/gallium/drivers/r300/r300_screen.c
+++ b/src/gallium/drivers/r300/r300_screen.c
@@ -144,6 +144,7 @@ static int r300_get_param(struct pipe_screen* pscreen, enum pipe_cap param)
         case PIPE_CAP_BUFFER_MAP_PERSISTENT_COHERENT:
         case PIPE_CAP_CLIP_HALFZ:
         case PIPE_CAP_ALLOW_MAPPED_BUFFERS_DURING_EXECUTION:
+        case PIPE_CAP_LEGACY_MATH_RULES:
             return 1;
 
         case PIPE_CAP_TEXTURE_TRANSFER_MODES: