diff --git a/src/gallium/drivers/r600/sfn/sfn_instr_export.cpp b/src/gallium/drivers/r600/sfn/sfn_instr_export.cpp
index 3d40ea1796a..00826ed6457 100644
--- a/src/gallium/drivers/r600/sfn/sfn_instr_export.cpp
+++ b/src/gallium/drivers/r600/sfn/sfn_instr_export.cpp
@@ -206,7 +206,7 @@ bool WriteScratchInstr::do_ready() const
 
 void WriteScratchInstr::do_print(std::ostream& os) const
 {
-   char buf[6];
+   char buf[6] = {0};
 
    os << "WRITE_SCRATCH ";
    if (m_address)