diff --git a/srcpkgs/sessreg/template b/srcpkgs/sessreg/template
index d9a535da24b..4337171006f 100644
--- a/srcpkgs/sessreg/template
+++ b/srcpkgs/sessreg/template
@@ -12,5 +12,5 @@ maintainer="Juan RP <xtraeme@voidlinux.eu>"
 distfiles="${XORG_SITE}/app/$pkgname-$version.tar.bz2"
 checksum=551177657835e0902b5eee7b19713035beaa1581bbd3c6506baa553e751e017c
 
-# musl does not define _WTMPX_FILE, use _WTMP_FILE instead.
-CFLAGS="-D_WTMPX_FILE=_WTMP_FILE"
+# musl does not define _WTMPX_FILE, use WTMP_FILE instead.
+CFLAGS="-D_WTMPX_FILE=WTMP_FILE"