--- a/security/manager/ssl/moz.build
+++ b/security/manager/ssl/moz.build
@@ -179,16 +179,17 @@ if CONFIG['NSS_DISABLE_DBM']:
 
 DEFINES['SSL_DISABLE_DEPRECATED_CIPHER_SUITE_NAMES'] = 'True'
 DEFINES['NSS_ENABLE_ECC'] = 'True'
 for var in ('DLL_PREFIX', 'DLL_SUFFIX'):
     DEFINES[var] = '"%s"' % CONFIG[var]
 
 DEFINES['CERT_AddTempCertToPerm'] = '__CERT_AddTempCertToPerm'
 
-USE_LIBS += [
-    'crmf',
-]
+if not CONFIG['MOZ_SYSTEM_NSS']:
+    USE_LIBS += [
+        'crmf',
+    ]
 
 include('/ipc/chromium/chromium-config.mozbuild')
 
 if CONFIG['GNU_CXX']:
     CXXFLAGS += ['-Wno-error=shadow']