diff --git a/testing/cargo-update/APKBUILD b/testing/cargo-update/APKBUILD
index 1463e6271fc..2a9bad73491 100644
--- a/testing/cargo-update/APKBUILD
+++ b/testing/cargo-update/APKBUILD
@@ -34,7 +34,7 @@ build() {
 }
 
 check() {
-	cargo test --frozen
+	TMPDIR="$srcdir" cargo test --frozen
 }
 
 package() {