diff --git a/run-tests b/run-tests
index 6a9fb31..5d685ac 100755
--- a/run-tests
+++ b/run-tests
@@ -14,10 +14,15 @@ def main(argv):
         exe = 'tests/' + test_name
         if os.path.exists(exe):
             os.unlink(exe)
-        rc = Popen(['./jtlc', '-o', exe, test_source]).wait()
+        rc = Popen(['./jtlc', '-E', '-o', exe + '.gen.c', test_source]).wait()
         if rc != 0:
             sys.stdout.write('Failed to compile test %s\n' % test_name)
             passed = False
+        if passed:
+            rc = Popen(['./jtlc', '-o', exe, test_source]).wait()
+            if rc != 0:
+                sys.stdout.write('Failed to compile test %s\n' % test_name)
+                passed = False
         if os.path.exists(exe):
             output = Popen([exe], stdout=PIPE).communicate()[0]
             if os.path.exists(exe + '.out'):
diff --git a/tests/.gitignore b/tests/.gitignore
index d26c090..ae93a28 100644
--- a/tests/.gitignore
+++ b/tests/.gitignore
@@ -1 +1,2 @@
 test???
+*.gen.*