diff --git a/src/gallium/drivers/swr/swr_screen.cpp b/src/gallium/drivers/swr/swr_screen.cpp
index 501468001e8..75a9d0227a8 100644
--- a/src/gallium/drivers/swr/swr_screen.cpp
+++ b/src/gallium/drivers/swr/swr_screen.cpp
@@ -166,7 +166,7 @@ swr_get_param(struct pipe_screen *screen, enum pipe_cap param)
       return MAX_SO_STREAMS;
    case PIPE_CAP_MAX_STREAM_OUTPUT_SEPARATE_COMPONENTS:
    case PIPE_CAP_MAX_STREAM_OUTPUT_INTERLEAVED_COMPONENTS:
-      return MAX_ATTRIBUTES;
+      return MAX_ATTRIBUTES * 4;
    case PIPE_CAP_MAX_GEOMETRY_OUTPUT_VERTICES:
    case PIPE_CAP_MAX_GEOMETRY_TOTAL_OUTPUT_COMPONENTS:
       return 1024;