diff --git a/src/add.c b/src/add.c
index 2d342ab..e028736 100644
--- a/src/add.c
+++ b/src/add.c
@@ -11,6 +11,7 @@
 
 #include <errno.h>
 #include <stdio.h>
+#include <unistd.h>
 #include "apk_applet.h"
 #include "apk_database.h"
 #include "apk_print.h"
@@ -80,6 +81,38 @@ static int non_repository_check(struct apk_database *db)
 	return 1;
 }
 
+static struct apk_package *create_virtual_package(struct apk_database *db, struct apk_name *name)
+{
+	char ver[32];
+	struct apk_package *virtpkg;
+	struct tm tm;
+	EVP_MD_CTX *mdctx;
+	time_t now = apk_time();
+	pid_t pid = getpid();
+
+	localtime_r(&now, &tm);
+	strftime(ver, sizeof ver, "%Y%m%d.%H%M%S", &tm);
+
+	virtpkg = apk_pkg_new();
+	if (virtpkg == NULL) return 0;
+
+	virtpkg->name = name;
+	virtpkg->version = apk_blob_atomize(APK_BLOB_STR(ver));
+	virtpkg->description = strdup("virtual meta package");
+	virtpkg->arch = apk_blob_atomize(APK_BLOB_STR("noarch"));
+
+	mdctx = EVP_MD_CTX_new();
+	EVP_DigestInit_ex(mdctx, apk_checksum_default(), NULL);
+	EVP_DigestUpdate(mdctx, &tm, sizeof tm);
+	EVP_DigestUpdate(mdctx, &pid, sizeof pid);
+	EVP_DigestUpdate(mdctx, virtpkg->name->name, strlen(virtpkg->name->name) + 1);
+	virtpkg->csum.type = EVP_MD_CTX_size(mdctx);
+	EVP_DigestFinal_ex(mdctx, virtpkg->csum.data, NULL);
+	EVP_MD_CTX_free(mdctx);
+
+	return virtpkg;
+}
+
 static int add_main(void *ctx, struct apk_database *db, struct apk_string_array *args)
 {
 	struct add_ctx *actx = (struct add_ctx *) ctx;
@@ -93,10 +126,6 @@ static int add_main(void *ctx, struct apk_database *db, struct apk_string_array
 
 	if (actx->virtpkg) {
 		apk_blob_t b = APK_BLOB_STR(actx->virtpkg);
-		struct tm tm;
-		time_t now;
-		char ver[32];
-
 		apk_blob_pull_dep(&b, db, &virtdep);
 		if (APK_BLOB_IS_NULL(b) || virtdep.conflict ||
 		    virtdep.result_mask != APK_DEPMASK_ANY ||
@@ -104,24 +133,14 @@ static int add_main(void *ctx, struct apk_database *db, struct apk_string_array
 			apk_error("%s: bad package specifier");
 			return -1;
 		}
-
 		if (virtdep.name->name[0] != '.' && non_repository_check(db))
 			return -1;
 
-		now = apk_time();
-		localtime_r(&now, &tm);
-		strftime(ver, sizeof ver, "%Y%m%d.%H%M%S", &tm);
-
-		virtpkg = apk_pkg_new();
-		if (virtpkg == NULL) {
+		virtpkg = create_virtual_package(db, virtdep.name);
+		if (!virtpkg) {
 			apk_error("Failed to allocate virtual meta package");
 			return -1;
 		}
-		virtpkg->name = virtdep.name;
-		apk_blob_checksum(APK_BLOB_STR(ver), apk_checksum_default(), &virtpkg->csum);
-		virtpkg->version = apk_blob_atomize(APK_BLOB_STR(ver));
-		virtpkg->description = strdup("virtual meta package");
-		virtpkg->arch = apk_blob_atomize(APK_BLOB_STR("noarch"));
 
 		virtdep.result_mask = APK_VERSION_EQUAL;
 		virtdep.version = virtpkg->version;