diff --git a/src/cpu/sparc/vm/copy_sparc.hpp b/src/cpu/sparc/vm/copy_sparc.hpp
index 13829b1da23eeadc28a978c2be60955e65fec7a3..3d8fb0e5d5a3fc21d5dffd39fc755f2414b28474 100644
--- a/src/cpu/sparc/vm/copy_sparc.hpp
+++ b/src/cpu/sparc/vm/copy_sparc.hpp
@@ -184,7 +184,7 @@ static void pd_fill_to_aligned_words(HeapWord* tohw, size_t count, juint value)
   assert(MinObjAlignmentInBytes >= BytesPerLong, "need alternate implementation");
 
   if (value == 0 && UseBlockZeroing &&
-      (count > (BlockZeroingLowLimit >> LogHeapWordSize))) {
+      (count > (size_t)(BlockZeroingLowLimit >> LogHeapWordSize))) {
    // Call it only when block zeroing is used
    ((_zero_Fn)StubRoutines::zero_aligned_words())(tohw, count);
   } else {