diff --git a/src/pacman/package.c b/src/pacman/package.c
index f2b6fa19..4fcc11f2 100644
--- a/src/pacman/package.c
+++ b/src/pacman/package.c
@@ -210,11 +210,11 @@ void dump_pkg_full(alpm_pkg_t *pkg, int extra)
 
 	/* set variables here, do all output below */
 	bdate = (time_t)alpm_pkg_get_builddate(pkg);
-	if(bdate) {
+	if(bdate != -1) {
 		strftime(bdatestr, 50, "%c", localtime(&bdate));
 	}
 	idate = (time_t)alpm_pkg_get_installdate(pkg);
-	if(idate) {
+	if(idate != -1) {
 		strftime(idatestr, 50, "%c", localtime(&idate));
 	}