diff --git a/community/heirloom-doctools/APKBUILD b/community/heirloom-doctools/APKBUILD
index 209c9449193..17591ed8345 100644
--- a/community/heirloom-doctools/APKBUILD
+++ b/community/heirloom-doctools/APKBUILD
@@ -34,7 +34,7 @@ _makeargs="
 
 build() {
 	# Unfortunately parallel build isn't supported.
-	make -j1 $_makeargs -C "$builddir"
+	CFLAGS="$CFLAGS -fcommon" make -j1 $_makeargs -C "$builddir"
 }
 
 package() {