diff --git a/Makefile.pdlibbuilder b/Makefile.pdlibbuilder
index 13c4ef0..5ee3935 100644
--- a/Makefile.pdlibbuilder
+++ b/Makefile.pdlibbuilder
@@ -445,7 +445,7 @@ ifeq ($(uname), Darwin)
   system = Darwin
 endif
 
-ifeq ($(filter MINGW% MSYS, $(uname)), $(uname)) 
+ifeq ($(filter MINGW% MSYS%, $(uname)), $(uname)) 
   system = Windows
 endif