diff --git a/arch/sparc/isa/decoder.isa b/arch/sparc/isa/decoder.isa
index 792918267..ca409fa66 100644
--- a/arch/sparc/isa/decoder.isa
+++ b/arch/sparc/isa/decoder.isa
@@ -127,7 +127,7 @@ decode OP default Unknown::unknown()
                     if(Rd.udw<63:31> != 0)
                         Rd.udw = 0x7FFFFFFF;
                     else if(Rd.udw<63:> && Rd.udw<62:31> != 0xFFFFFFFF)
-                        Rd.udw = 0xFFFFFFFF80000000;
+                        Rd.udw = 0xFFFFFFFF80000000ULL;
                 }
             }});
         }
@@ -214,7 +214,7 @@ decode OP default Unknown::unknown()
                     overflow = (resTemp<63:31> != 0);
                     underflow = (resTemp<63:> && resTemp<62:31> != 0xFFFFFFFF);
                     if(overflow) Rd = resTemp = 0x7FFFFFFF;
-                    else if(underflow) Rd = resTemp = 0xFFFFFFFF80000000;
+                    else if(underflow) Rd = resTemp = 0xFFFFFFFF80000000ULL;
                     else Rd = resTemp;
                 } }},
                 {{0}},
diff --git a/arch/sparc/process.cc b/arch/sparc/process.cc
index f771b0d19..7f2b0d40a 100644
--- a/arch/sparc/process.cc
+++ b/arch/sparc/process.cc
@@ -85,7 +85,7 @@ SparcLiveProcess::SparcLiveProcess(const std::string &nm, ObjectFile *objFile,
 
     // Set up stack. On SPARC Linux, stack goes from the top of memory
     // downward, less the hole for the kernel address space.
-    stack_base = ((Addr)0x80000000000);
+    stack_base = ((Addr)0x80000000000ULL);
 
     // Set up region for mmaps.  Tru64 seems to start just above 0 and
     // grow up from there.