diff --git a/lldb/source/Plugins/ObjectFile/Minidump/MinidumpFileBuilder.cpp b/lldb/source/Plugins/ObjectFile/Minidump/MinidumpFileBuilder.cpp
--- a/lldb/source/Plugins/ObjectFile/Minidump/MinidumpFileBuilder.cpp
+++ b/lldb/source/Plugins/ObjectFile/Minidump/MinidumpFileBuilder.cpp
@@ -729,7 +729,7 @@
   if (error.Fail() || bytes_written != header_size) {
     if (bytes_written != header_size)
       error.SetErrorStringWithFormat(
-          "Unable to write the header. (written %ld/%ld).", bytes_written,
+          "Unable to write the header. (written %zd/%zd).", bytes_written,
           header_size);
     return error;
   }
@@ -740,7 +740,7 @@
   if (error.Fail() || bytes_written != m_data.GetByteSize()) {
     if (bytes_written != m_data.GetByteSize())
       error.SetErrorStringWithFormat(
-          "Unable to write the data. (written %ld/%ld).", bytes_written,
+          "Unable to write the data. (written %zd/%zd).", bytes_written,
           m_data.GetByteSize());
     return error;
   }
@@ -752,7 +752,7 @@
     if (error.Fail() || bytes_written != directory_size) {
       if (bytes_written != directory_size)
         error.SetErrorStringWithFormat(
-            "Unable to write the directory. (written %ld/%ld).", bytes_written,
+            "Unable to write the directory. (written %zd/%zd).", bytes_written,
             directory_size);
       return error;
     }