diff --git a/Makefile.pdlibbuilder b/Makefile.pdlibbuilder
index bce69dd..94c4116 100644
--- a/Makefile.pdlibbuilder
+++ b/Makefile.pdlibbuilder
@@ -445,7 +445,7 @@ ifeq ($(uname), Darwin)
   system = Darwin
 endif
 
-ifeq ($(findstring MINGW, $(uname)), MINGW)
+ifeq ($(findstring $(uname), MINGW MSYS), $(uname))
   system = Windows
 endif