diff --git a/tests/run-tests.cpp b/tests/run-tests.cpp
index f2d121c..13565d4 100644
--- a/tests/run-tests.cpp
+++ b/tests/run-tests.cpp
@@ -26,6 +26,8 @@ int main() {
 
     int total = 0, passed = 0;
     for (char version = 1; version <= 40; version++) {
+        if (LOCK_VERSION != 0 && LOCK_VERSION != version) { continue; }
+
         for (char ecc = 0; ecc < 4; ecc++) {
             const qrcodegen::QrCode::Ecc *errCorLvl;
             switch (ecc) {
diff --git a/tests/run.sh b/tests/run.sh
index 056ae5d..ff7be5f 100755
--- a/tests/run.sh
+++ b/tests/run.sh
@@ -1,4 +1,5 @@
 #!/bin/bash
 
 clang++ run-tests.cpp QrCode.cpp QrSegment.cpp BitBuffer.cpp ../src/qrcode.c -o test && ./test
+clang++ run-tests.cpp QrCode.cpp QrSegment.cpp BitBuffer.cpp ../src/qrcode.c -o test -D LOCK_VERSION=3 && ./test