diff --git a/src/process_win.cpp b/src/process_win.cpp
index 89b5a8f..bfd3699 100644
--- a/src/process_win.cpp
+++ b/src/process_win.cpp
@@ -96,6 +96,10 @@ Process::id_type Process::open(const std::string &command, const std::string &pa
 #ifdef MSYS_PROCESS_USE_SH
   size_t pos=0;
   std::string sh_command=command;
+  while((pos=sh_command.find('\\', pos))!=std::string::npos) {
+    sh_command.replace(pos, 1, "\\\\\\");
+    pos+=3;
+  }
   while((pos=sh_command.find('\"', pos))!=std::string::npos) {
     if(pos>0 && sh_command[pos-1]!='\\') {
       sh_command.replace(pos, 1, "\\\"");