diff --git a/lib/vtls/polarssl.c b/lib/vtls/polarssl.c
index 59d29172c..3e1216365 100644
--- a/lib/vtls/polarssl.c
+++ b/lib/vtls/polarssl.c
@@ -99,7 +99,7 @@ static int entropy_func_mutex(void *data, unsigned char *output, size_t len)
 }
 /* end of entropy_func_mutex() */
 
-#endif /* THREADING_SUPPORT
+#endif /* THREADING_SUPPORT */
 
 /* Define this to enable lots of debugging for PolarSSL */
 #undef POLARSSL_DEBUG