1 files changed, 1 insertions, 1 deletions
diff --git a/Makefile b/Makefile
index 292880d..b41ff55 100644
--- a/Makefile
+++ b/Makefile
@@ -3,7 +3,7 @@ DATADIR?=data
 BUILDDIR?=build
 SPEC=spec.txt
 SITE=_site
-SPECVERSION=`perl -ne 'print $$1 if /^version: *([0-9.]+)/' $(SPEC)`
+SPECVERSION=$(shell perl -ne 'print $$1 if /^version: *([0-9.]+)/' $(SPEC))
 PKGDIR?=cmark-$(SPECVERSION)
 TARBALL?=cmark-$(SPECVERSION).tar.gz
 FUZZCHARS?=2000000  # for fuzztest