diff --git a/Libraries/LibC/crt0.cpp b/Libraries/LibC/crt0.cpp
index 82005fc9a2..9136539ae7 100644
--- a/Libraries/LibC/crt0.cpp
+++ b/Libraries/LibC/crt0.cpp
@@ -6,7 +6,7 @@ extern "C" {
 
 int main(int, char**);
 
-int errno;
+__thread int errno;
 char** environ;
 bool __environ_is_malloced;
 
diff --git a/Libraries/LibC/errno.h b/Libraries/LibC/errno.h
index 7ac77c5e42..68db1a0417 100644
--- a/Libraries/LibC/errno.h
+++ b/Libraries/LibC/errno.h
@@ -17,6 +17,6 @@ __BEGIN_DECLS
 
 extern const char* sys_errlist[];
 extern int sys_nerr;
-extern int errno;
+extern __thread int errno;
 
 __END_DECLS