diff --git a/lldb/include/lldb/Utility/FileSpec.h b/lldb/include/lldb/Utility/FileSpec.h
--- a/lldb/include/lldb/Utility/FileSpec.h
+++ b/lldb/include/lldb/Utility/FileSpec.h
@@ -202,7 +202,7 @@
   /// \return
   ///     \b true if the file path is case sensitive (POSIX), false
   ///		if case insensitive (Windows).
-  bool IsCaseSensitive() const { return m_style != Style::windows; }
+  bool IsCaseSensitive() const { return is_style_posix(m_style); }
 
   /// Dump this object to a Stream.
   ///
diff --git a/lldb/source/Utility/FileSpec.cpp b/lldb/source/Utility/FileSpec.cpp
--- a/lldb/source/Utility/FileSpec.cpp
+++ b/lldb/source/Utility/FileSpec.cpp
@@ -43,9 +43,7 @@
 }
 
 bool PathStyleIsPosix(FileSpec::Style style) {
-  return (style == FileSpec::Style::posix ||
-          (style == FileSpec::Style::native &&
-           GetNativeStyle() == FileSpec::Style::posix));
+  return llvm::sys::path::is_style_posix(style);
 }
 
 const char *GetPathSeparators(FileSpec::Style style) {