diff --git a/m4/PKGBUILD b/m4/PKGBUILD
index 5c98ff22..551dec8a 100644
--- a/m4/PKGBUILD
+++ b/m4/PKGBUILD
@@ -9,13 +9,13 @@ url="https://www.gnu.org/software/m4"
 license=('GPL3')
 groups=('base-devel')
 depends=('bash' 'gcc-libs' 'msys2-runtime')
-makedepends=('')
 install=m4.install
 source=(https://ftp.gnu.org/gnu/m4/$pkgname-$pkgver.tar.xz{,.sig}
         m4-1.4.17-msys2.patch)
 sha256sums=('f2c1e86ca0a404ff281631bdc8377638992744b175afb806e25871a24a934e07'
             'SKIP'
             'ea969a4948ba0f4457446602e991d579e27be6cf825ae9a63341f3fa9ea2bb75')
+validpgpkeys=('71C2CC22B1C4602927D2F3AAA7A16B4A2527436A')  # Eric Blake <eblake@redhat.com>
 
 prepare() {
   cd ${srcdir}/$pkgname-$pkgver