diff --git a/bsp_q7s/memory/SdCardManager.cpp b/bsp_q7s/memory/SdCardManager.cpp
index c1b2b8de..d4b22e59 100644
--- a/bsp_q7s/memory/SdCardManager.cpp
+++ b/bsp_q7s/memory/SdCardManager.cpp
@@ -544,8 +544,8 @@ ReturnValue_t SdCardManager::performFsck(sd::SdCard sdcard, bool printOutput, in
 }
 
 void SdCardManager::setActiveSdCard(sd::SdCard sdCard) {
-  sdInfo.active = sdCard;
   MutexGuard mg(mutex);
+  sdInfo.active = sdCard;
   if (sdInfo.active == sd::SdCard::SLOT_0) {
     currentPrefix = SD_0_MOUNT_POINT;
   } else {