diff --git a/archival/dpkg.c b/archival/dpkg.c
index 48c392894..d7279cfd0 100644
--- a/archival/dpkg.c
+++ b/archival/dpkg.c
@@ -217,7 +217,7 @@ int version_compare_part(const char *version1, const char *version2)
 	if (version1 == NULL) {
 		version1 = xstrdup("");
 	}
-	if (version2 != NULL) {
+	if (version2 == NULL) {
 		version2 = xstrdup("");
 	}
 	upstream_len1 = strlen(version1);
diff --git a/dpkg.c b/dpkg.c
index 48c392894..d7279cfd0 100644
--- a/dpkg.c
+++ b/dpkg.c
@@ -217,7 +217,7 @@ int version_compare_part(const char *version1, const char *version2)
 	if (version1 == NULL) {
 		version1 = xstrdup("");
 	}
-	if (version2 != NULL) {
+	if (version2 == NULL) {
 		version2 = xstrdup("");
 	}
 	upstream_len1 = strlen(version1);