diff --git a/llvm/tools/lli/RemoteJITUtils.h b/llvm/tools/lli/RemoteJITUtils.h
index 792d8d0dedf3..a3f3fa0fd3b4 100644
--- a/llvm/tools/lli/RemoteJITUtils.h
+++ b/llvm/tools/lli/RemoteJITUtils.h
@@ -31,7 +31,7 @@ public:
   std::error_code readBytes(char *Dst, unsigned Size) override {
     assert(Dst && "Attempt to read into null.");
     ssize_t ReadResult = ::read(InFD, Dst, Size);
-    if (ReadResult != Size)
+    if (ReadResult != (ssize_t)Size)
       return std::error_code(errno, std::generic_category());
     return std::error_code();
   }
@@ -39,7 +39,7 @@ public:
   std::error_code appendBytes(const char *Src, unsigned Size) override {
     assert(Src && "Attempt to append from null.");
     ssize_t WriteResult = ::write(OutFD, Src, Size);
-    if (WriteResult != Size)
+    if (WriteResult != (ssize_t)Size)
       std::error_code(errno, std::generic_category());
     return std::error_code();
   }