diff --git a/Source/cmFileCommand.cxx b/Source/cmFileCommand.cxx
index b0ddff4..481185c 100644
--- a/Source/cmFileCommand.cxx
+++ b/Source/cmFileCommand.cxx
@@ -1116,7 +1116,7 @@ protected:
   MatchProperties CollectMatchProperties(const char* file)
     {
     // Match rules are case-insensitive on some platforms.
-#if defined(_WIN32) || defined(__APPLE__) || defined(__CYGWIN__)
+#if defined(_WIN32) || defined(__APPLE__)
     std::string lower = cmSystemTools::LowerCase(file);
     const char* file_to_match = lower.c_str();
 #else
diff --git a/Source/cmInstallCommand.cxx b/Source/cmInstallCommand.cxx
index c3c9c55..077cbd8 100644
--- a/Source/cmInstallCommand.cxx
+++ b/Source/cmInstallCommand.cxx
@@ -1149,7 +1149,7 @@ cmInstallCommand::HandleDirectoryMode(std::vector<std::string> const& args)
       {
       literal_args += " REGEX \"";
     // Match rules are case-insensitive on some platforms.
-#if defined(_WIN32) || defined(__APPLE__) || defined(__CYGWIN__)
+#if defined(_WIN32) || defined(__APPLE__)
       std::string regex = cmSystemTools::LowerCase(args[i]);
 #else
       std::string regex = args[i];
diff --git a/Source/kwsys/Glob.cxx b/Source/kwsys/Glob.cxx
index 5a96aed..9379e76 100644
--- a/Source/kwsys/Glob.cxx
+++ b/Source/kwsys/Glob.cxx
@@ -37,7 +37,7 @@
 #include <string.h>
 namespace KWSYS_NAMESPACE
 {
-#if defined(_WIN32) || defined(__APPLE__) || defined(__CYGWIN__)
+#if defined(_WIN32) || defined(__APPLE__)
 // On Windows and apple, no difference between lower and upper case
 # define KWSYS_GLOB_CASE_INDEPENDENT
 #endif