diff --git a/llvm/lib/DebugInfo/GSYM/FunctionInfo.cpp b/llvm/lib/DebugInfo/GSYM/FunctionInfo.cpp
--- a/llvm/lib/DebugInfo/GSYM/FunctionInfo.cpp
+++ b/llvm/lib/DebugInfo/GSYM/FunctionInfo.cpp
@@ -114,7 +114,7 @@
     llvm::Error err = OptLineTable->encode(O, Range.Start);
     if (err)
       return std::move(err);
-    const off_t Length = O.tell() - StartOffset;
+    const uint64_t Length = O.tell() - StartOffset;
     if (Length > UINT32_MAX)
         return createStringError(std::errc::invalid_argument,
             "LineTable length is greater than UINT32_MAX");
@@ -132,7 +132,7 @@
     llvm::Error err = Inline->encode(O, Range.Start);
     if (err)
       return std::move(err);
-    const off_t Length = O.tell() - StartOffset;
+    const uint64_t Length = O.tell() - StartOffset;
     if (Length > UINT32_MAX)
         return createStringError(std::errc::invalid_argument,
             "InlineInfo length is greater than UINT32_MAX");