diff --git a/pkg/win32/GNUmakefile b/pkg/win32/GNUmakefile
index 97b8a081..bf752501 100644
--- a/pkg/win32/GNUmakefile
+++ b/pkg/win32/GNUmakefile
@@ -38,12 +38,12 @@ hook-strife: staging-strife
 
 staging-%:
 	mkdir $@
-	./cp-with-libs --ldflags="$(LDFLAGS)" \
+	LC_ALL=C ./cp-with-libs --ldflags="$(LDFLAGS)" \
 	               $(TOPLEVEL)/src/$(PROGRAM_PREFIX)$*.exe $@
-	./cp-with-libs --ldflags="$(LDFLAGS)" \
+	LC_ALL=C ./cp-with-libs --ldflags="$(LDFLAGS)" \
 	               $(TOPLEVEL)/src/$(PROGRAM_PREFIX)setup.exe \
 	               $@/$(PROGRAM_PREFIX)$*-setup.exe
-	./cp-with-libs --ldflags="$(LDFLAGS)" \
+	LC_ALL=C ./cp-with-libs --ldflags="$(LDFLAGS)" \
 	               $(TOPLEVEL)/midiproc/$(PROGRAM_PREFIX)midiproc.exe \
 	               $@/$(PROGRAM_PREFIX)midiproc.exe