diff --git a/src/mesa/drivers/dri/i965/brw_fs.cpp b/src/mesa/drivers/dri/i965/brw_fs.cpp
index 8f1cd61d3b6..e18aa72bd2c 100644
--- a/src/mesa/drivers/dri/i965/brw_fs.cpp
+++ b/src/mesa/drivers/dri/i965/brw_fs.cpp
@@ -900,7 +900,7 @@ fs_inst::size_read(int arg) const
    switch (src[arg].file) {
    case UNIFORM:
    case IMM:
-      return 4;
+      return components_read(arg) * type_sz(src[arg].type);
    case BAD_FILE:
    case ARF:
    case FIXED_GRF: