diff --git a/src/crystal/util/ports.py b/src/crystal/util/ports.py
index 98681edc..134f71cd 100644
--- a/src/crystal/util/ports.py
+++ b/src/crystal/util/ports.py
@@ -1,8 +1,6 @@
 def is_port_in_use_error(e: Exception) -> bool:
-    if isinstance(e, OSError) and e.errno == 48:
-        # macOS: [Errno 48] Address already in use
-        return True
-    if isinstance(e, OSError) and e.errno == 98:
-        # Linux: [Errno 98] Address already in use
+    # macOS: [Errno 48] Address already in use
+    # Linux: [Errno 98] Address already in use
+    if isinstance(e, OSError) and str(e) == 'Address already in use':
         return True
     return False