diff --git a/src/arch/sparc/isa/formats/mem/swap.isa b/src/arch/sparc/isa/formats/mem/swap.isa
index b71542a2b..f3d15670f 100644
--- a/src/arch/sparc/isa/formats/mem/swap.isa
+++ b/src/arch/sparc/isa/formats/mem/swap.isa
@@ -39,7 +39,7 @@ def template SwapExecute {{
             Addr EA;
             %(fp_enable_check)s;
             %(op_decl)s;
-            uint64_t mem_data;
+            uint64_t mem_data = 0;
 
             %(op_rd)s;
             %(ea_code)s;