diff --git a/mk/win32.mk b/mk/win32.mk
index fc179563e..15903919a 100644
--- a/mk/win32.mk
+++ b/mk/win32.mk
@@ -264,12 +264,12 @@ endef
 define MakeCXXExportSymbolDefinitionFile
 symrefdir=$${debug:+debug}; \
 symreflib=$(SharedLibrarySymbolRefLibraryTemplate); \
 if [ ! -f $$symreflib ]; then echo "Cannot find reference static library $$symreflib"; return 1; fi;  \
 set -x; \
 echo "LIBRARY $$dllbase" > $$defname; \
 echo "VERSION $$version" >> $$defname; \
 echo "EXPORTS" >> $$defname; \
-DUMPBIN.EXE /SYMBOLS $$symreflib | \
+DUMPBIN.EXE $$symreflib -SYMBOLS | \
 egrep '^[^ ]+ +[^ ]+ +SECT[^ ]+ +[^ ]+ +\(\) +External +\| +\?[^ ]*|^[^ ]+ +[^ ]+ +SECT[^ ]+ +[^ ]+ +External +\| +\?[^?][^ ]*'|\
 egrep -v 'deleting destructor[^(]+\(unsigned int\)' | \
 egrep -v 'anonymous namespace' | \