diff --git a/abuild.in b/abuild.in
index a81ac49..1f330b1 100644
--- a/abuild.in
+++ b/abuild.in
@@ -1077,7 +1077,8 @@ trace_apk_deps() {
 
 	echo "# automatically detected:" >> "$dir"/.PKGINFO
 	if [ -f "$dir"/.provides-so ]; then
-		sed 's/^\(.*\) \([0-9].*\)/provides = so:\1=\2/' "$dir"/.provides-so \
+		sed 's/^\(.*\) \([0-9].*\)/provides = so:\1=\2/' \
+			"$dir"/.provides-so | sort -u \
 			>> "$dir"/.PKGINFO
 	fi
 	if [ -f "$dir"/.provides-pc ]; then