diff --git a/GNUmakefile b/GNUmakefile
index ac4a2b6..5096e4e 100644
--- a/GNUmakefile
+++ b/GNUmakefile
@@ -51,7 +51,7 @@ endif
 XNU_VERSION?=	$(shell uname -a|sed 's/^.*root:xnu-//g'|sed 's/~.*$$//')
 OSX_VERSION?=	$(shell sw_vers -productVersion)
 ifeq ($(wildcard xnu/xnu-$(XNU_VERSION)),)
-XNU_VERSION=	$(shell awk '/# $(OSX_VERSION)$/ {print $2}' xnu/GNUmakefile)
+XNU_VERSION=	$(shell awk '/# $(OSX_VERSION)$$/ {print $$2}' xnu/GNUmakefile)
 endif
 ifneq ($(wildcard xnu/xnu-$(XNU_VERSION)),)
 FEATURES+=	-DHAVE_PF