diff --git a/npa/win32/Makefile.am b/npa/win32/Makefile.am
index 608271a..460217b 100644
--- a/npa/win32/Makefile.am
+++ b/npa/win32/Makefile.am
@@ -1,4 +1,5 @@
 MINGW ?= i686-w64-mingw32
+MINGW_DIR ?= /usr/$(MINGW)
 WIN32_DIR ?= $(abs_top_builddir)/$(PACKAGE_TARNAME)-$(PACKAGE_VERSION)_win32
 
 OPENPACE=$(abs_builddir)/openpace