diff --git a/simplecpp.cpp b/simplecpp.cpp
index fd327549..74ab66e1 100644
--- a/simplecpp.cpp
+++ b/simplecpp.cpp
@@ -2385,12 +2385,17 @@ namespace simplecpp {
 namespace simplecpp {
 
 #ifdef __CYGWIN__
+    static bool startsWith(const std::string &s, const std::string &p)
+    {
+        return (s.size() >= p.size()) && std::equal(p.begin(), p.end(), s.begin());
+    }
+
     std::string convertCygwinToWindowsPath(const std::string &cygwinPath)
     {
         std::string windowsPath;
 
         std::string::size_type pos = 0;
-        if (cygwinPath.size() >= 11 && startsWith_(cygwinPath, "/cygdrive/")) {
+        if (cygwinPath.size() >= 11 && startsWith(cygwinPath, "/cygdrive/")) {
             const unsigned char driveLetter = cygwinPath[10];
             if (std::isalpha(driveLetter)) {
                 if (cygwinPath.size() == 11) {