--- a/src/netxs/os/system.hpp
+++ b/src/netxs/os/system.hpp
@@ -1696,7 +1696,7 @@
             #elif defined(__linux__)
 
                 auto cred = ucred{};
-                #ifndef __ANDROID__
+                #ifdef __ANDROID__
                     socklen_t size = sizeof(cred);
                 #else
                     unsigned size = sizeof(cred);