diff --git a/pretix_passbook/apps.py b/pretix_passbook/apps.py
index e34eee1..a7ad382 100644
--- a/pretix_passbook/apps.py
+++ b/pretix_passbook/apps.py
@@ -22,15 +22,6 @@ class PassbookApp(AppConfig):
     def ready(self):
         from . import signals  # NOQA
 
-    @cached_property
-    def compatibility_errors(self):
-        import shutil
-
-        errs = []
-        if not shutil.which("openssl"):
-            errs.append("The OpenSSL binary is not installed or not in the PATH.")
-        return errs
-
     @cached_property
     def compatibility_warnings(self):
         errs = []
diff --git a/pretix_passbook/forms.py b/pretix_passbook/forms.py
index 2a38604..aec38de 100644
--- a/pretix_passbook/forms.py
+++ b/pretix_passbook/forms.py
@@ -41,7 +41,7 @@ class CertificateFileField(forms.FileField):
                 return SimpleUploadedFile("cert.pem", content, "text/plain")
 
             openssl_cmd = [
-                "openssl",
+                "@openssl@",
                 "x509",
                 "-inform",
                 "DER",