diff --git a/src/intel/compiler/brw_ir_fs.h b/src/intel/compiler/brw_ir_fs.h
index 6ba3a6ca97e..3a4acc1834a 100644
--- a/src/intel/compiler/brw_ir_fs.h
+++ b/src/intel/compiler/brw_ir_fs.h
@@ -451,13 +451,15 @@ regs_written(const fs_inst *inst)
  * Return the number of dataflow registers read by the instruction (either
  * fully or partially) counted from 'floor(reg_offset(inst->src[i]) /
  * register_size)'.  The somewhat arbitrary register size unit is 4B for the
- * UNIFORM and IMM files and 32B for all other files.
+ * UNIFORM files and 32B for all other files.
  */
 inline unsigned
 regs_read(const fs_inst *inst, unsigned i)
 {
-   const unsigned reg_size =
-      inst->src[i].file == UNIFORM || inst->src[i].file == IMM ? 4 : REG_SIZE;
+   if (inst->src[i].file == IMM)
+      return 1;
+
+   const unsigned reg_size = inst->src[i].file == UNIFORM ? 4 : REG_SIZE;
    return DIV_ROUND_UP(reg_offset(inst->src[i]) % reg_size +
                        inst->size_read(i) -
                        MIN2(inst->size_read(i), reg_padding(inst->src[i])),