diff --git a/src/node_crypto.cc b/src/node_crypto.cc
index 19cc30ee41f410..7f78a427042f4b 100644
--- a/src/node_crypto.cc
+++ b/src/node_crypto.cc
@@ -146,13 +146,13 @@ static X509_NAME *cnnic_ev_name =
 
 static Mutex* mutexes;
 
-const char* const root_certs[] = {
+static const char* const root_certs[] = {
 #include "node_root_certs.h"  // NOLINT(build/include_order)
 };
 
-std::string extra_root_certs_file;  // NOLINT(runtime/string)
+static std::string extra_root_certs_file;  // NOLINT(runtime/string)
 
-X509_STORE* root_cert_store;
+static X509_STORE* root_cert_store;
 
 // Just to generate static methods
 template void SSLWrap<TLSWrap>::AddMethods(Environment* env,
diff --git a/src/node_crypto.h b/src/node_crypto.h
index 2d78a38974ed22..33c9cf783ecedb 100644
--- a/src/node_crypto.h
+++ b/src/node_crypto.h
@@ -84,8 +84,6 @@ enum CheckResult {
 
 extern int VerifyCallback(int preverify_ok, X509_STORE_CTX* ctx);
 
-extern X509_STORE* root_cert_store;
-
 extern void UseExtraCaCerts(const std::string& file);
 
 class SecureContext : public BaseObject {