diff --git a/Userland/Libraries/LibC/netdb.cpp b/Userland/Libraries/LibC/netdb.cpp
index 45b13b39e15..96b934a662a 100644
--- a/Userland/Libraries/LibC/netdb.cpp
+++ b/Userland/Libraries/LibC/netdb.cpp
@@ -19,7 +19,11 @@
 
 extern "C" {
 
+#ifdef NO_TLS
 int h_errno;
+#else
+__thread int h_errno;
+#endif
 
 static hostent __gethostbyname_buffer;
 static in_addr_t __gethostbyname_address;
diff --git a/Userland/Libraries/LibC/netdb.h b/Userland/Libraries/LibC/netdb.h
index eec4f3b4969..8fff8cc471b 100644
--- a/Userland/Libraries/LibC/netdb.h
+++ b/Userland/Libraries/LibC/netdb.h
@@ -48,7 +48,11 @@ struct protoent* getprotobynumber(int proto);
 struct protoent* getprotoent(void);
 void setprotoent(int stay_open);
 
+#ifdef NO_TLS
 extern int h_errno;
+#else
+extern __thread int h_errno;
+#endif
 
 #define HOST_NOT_FOUND 101
 #define NO_DATA 102