diff --git a/lib/Target/CBackend/CBackend.cpp b/lib/Target/CBackend/CBackend.cpp
index 120448a2f48..6786780d23e 100644
--- a/lib/Target/CBackend/CBackend.cpp
+++ b/lib/Target/CBackend/CBackend.cpp
@@ -685,7 +685,7 @@ void CWriter::printConstant(Constant *CPV) {
         char Buffer[100];
 
         uint64_t ll = DoubleToBits(FPC->getValue());
-        sprintf(Buffer, "0x%llx", uint64_t(ll));
+        sprintf(Buffer, "0x%llx", static_cast<long long>(ll));
 
         std::string Num(&Buffer[0], &Buffer[6]);
         unsigned long Val = strtoul(Num.c_str(), 0, 16);
diff --git a/lib/Target/CBackend/Writer.cpp b/lib/Target/CBackend/Writer.cpp
index 120448a2f48..6786780d23e 100644
--- a/lib/Target/CBackend/Writer.cpp
+++ b/lib/Target/CBackend/Writer.cpp
@@ -685,7 +685,7 @@ void CWriter::printConstant(Constant *CPV) {
         char Buffer[100];
 
         uint64_t ll = DoubleToBits(FPC->getValue());
-        sprintf(Buffer, "0x%llx", uint64_t(ll));
+        sprintf(Buffer, "0x%llx", static_cast<long long>(ll));
 
         std::string Num(&Buffer[0], &Buffer[6]);
         unsigned long Val = strtoul(Num.c_str(), 0, 16);