diff --git a/src/gallium/drivers/r600/sfn/sfn_shader.cpp b/src/gallium/drivers/r600/sfn/sfn_shader.cpp
index 19efe3800dd..dac6ddcae48 100644
--- a/src/gallium/drivers/r600/sfn/sfn_shader.cpp
+++ b/src/gallium/drivers/r600/sfn/sfn_shader.cpp
@@ -520,7 +520,8 @@ Shader::allocate_local_registers(const exec_list *registers)
 {
    if (value_factory().allocate_registers(registers))
       m_indirect_files |= 1 << TGSI_FILE_TEMPORARY;
-   m_required_registers = value_factory().next_register_index() - 1;
+   m_required_registers = value_factory().next_register_index() ?
+                             value_factory().next_register_index() - 1 : 0;
 }
 
 bool