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diff --git a/security/certverifier/NSSCertDBTrustDomain.cpp b/security/certverifier/NSSCertDBTrustDomain.cpp
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--- a/security/certverifier/NSSCertDBTrustDomain.cpp
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+++ b/security/certverifier/NSSCertDBTrustDomain.cpp
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@@ -1057,22 +1057,20 @@ InitializeNSS(const nsACString& dir, boo
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   // "/usr/lib/nss/libnssckbi.so".
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   uint32_t flags = NSS_INIT_NOROOTINIT | NSS_INIT_OPTIMIZESPACE;
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   if (readOnly) {
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     flags |= NSS_INIT_READONLY;
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   }
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   if (!loadPKCS11Modules) {
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     flags |= NSS_INIT_NOMODDB;
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   }
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-  nsAutoCString dbTypeAndDirectory("sql:");
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-  dbTypeAndDirectory.Append(dir);
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   MOZ_LOG(gCertVerifierLog, LogLevel::Debug,
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-          ("InitializeNSS(%s, %d, %d)", dbTypeAndDirectory.get(), readOnly,
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+          ("InitializeNSS(%s, %d, %d)", PromiseFlatCString(dir).get(), readOnly,
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            loadPKCS11Modules));
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-  SECStatus srv = NSS_Initialize(dbTypeAndDirectory.get(), "", "",
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+  SECStatus srv = NSS_Initialize(PromiseFlatCString(dir).get(), "", "",
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                                  SECMOD_DB, flags);
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   if (srv != SECSuccess) {
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     return srv;
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   }
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   if (!readOnly) {
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     UniquePK11SlotInfo slot(PK11_GetInternalKeySlot());
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     if (!slot) {