diff --git a/compat/libtls/openssl.c b/compat/libtls/openssl.c
index 8c0b5ed..3528887 100644
--- a/compat/libtls/openssl.c
+++ b/compat/libtls/openssl.c
@@ -31,7 +31,7 @@
 X509_LOOKUP_METHOD *
 X509_LOOKUP_mem(void);
 
-int
+static int
 X509_STORE_load_mem(X509_STORE *ctx, void *buf, int len)
 {
         X509_LOOKUP             *lookup;