--- a/make/autoconf/spec.gmk.in	Mon Jun 11 21:56:58 2018 +0000
+++ b/make/autoconf/spec.gmk.in	Tue Jun 12 01:31:49 2018 +0200
@@ -858,7 +858,12 @@
 else ifneq ($(DEBUG_LEVEL), release)
   DEBUG_PART := -$(DEBUG_LEVEL)
 endif
-JDK_BUNDLE_NAME := jdk-$(BASE_NAME)_bin$(DEBUG_PART).tar.gz
+ifeq ($(OPENJDK_TARGET_OS), windows)
+  JDK_BUNDLE_EXTENSION := zip
+else
+  JDK_BUNDLE_EXTENSION := tar.gz
+endif
+JDK_BUNDLE_NAME := jdk-$(BASE_NAME)_bin$(DEBUG_PART).$(JDK_BUNDLE_EXTENSION)
 JDK_SYMBOLS_BUNDLE_NAME := jdk-$(BASE_NAME)_bin$(DEBUG_PART)-symbols.tar.gz
 TEST_DEMOS_BUNDLE_NAME := jdk-$(BASE_NAME)_bin-tests-demos$(DEBUG_PART).tar.gz
 TEST_BUNDLE_NAME := jdk-$(BASE_NAME)_bin-tests$(DEBUG_PART).tar.gz