diff --git a/src/lorawan.cpp b/src/lorawan.cpp
index 440b4a47..d83eaca7 100644
--- a/src/lorawan.cpp
+++ b/src/lorawan.cpp
@@ -19,7 +19,7 @@ RTC_DATA_ATTR lmic_t RTC_LMIC;
 #endif
 #endif
 
-QueueHandle_t LoraSendQueue;
+static QueueHandle_t LoraSendQueue;
 TaskHandle_t lmicTask = NULL, lorasendTask = NULL;
 
 class MyHalConfig_t : public Arduino_LMIC::HalConfiguration_t {
diff --git a/src/macsniff.cpp b/src/macsniff.cpp
index e5044039..2ff27634 100644
--- a/src/macsniff.cpp
+++ b/src/macsniff.cpp
@@ -6,7 +6,7 @@
 // Local logging tag
 static const char TAG[] = __FILE__;
 
-QueueHandle_t MacQueue;
+static QueueHandle_t MacQueue;
 TaskHandle_t macProcessTask;
 
 static uint32_t salt = renew_salt();
diff --git a/src/mqttclient.cpp b/src/mqttclient.cpp
index 3be38ba9..89d54fde 100644
--- a/src/mqttclient.cpp
+++ b/src/mqttclient.cpp
@@ -4,7 +4,7 @@
 
 static const char TAG[] = __FILE__;
 
-QueueHandle_t MQTTSendQueue;
+static QueueHandle_t MQTTSendQueue;
 TaskHandle_t mqttTask;
 
 Ticker mqttTimer;
diff --git a/src/rcommand.cpp b/src/rcommand.cpp
index b568b505..0426c475 100644
--- a/src/rcommand.cpp
+++ b/src/rcommand.cpp
@@ -5,7 +5,7 @@
 // Local logging tag
 static const char TAG[] = __FILE__;
 
-QueueHandle_t RcmdQueue;
+static QueueHandle_t RcmdQueue;
 TaskHandle_t rcmdTask;
 
 // set of functions that can be triggered by remote commands
diff --git a/src/spislave.cpp b/src/spislave.cpp
index d0778384..4b2087d8 100644
--- a/src/spislave.cpp
+++ b/src/spislave.cpp
@@ -43,7 +43,7 @@ static const char TAG[] = __FILE__;
 DMA_ATTR uint8_t txbuf[BUFFER_SIZE];
 DMA_ATTR uint8_t rxbuf[BUFFER_SIZE];
 
-QueueHandle_t SPISendQueue;
+static QueueHandle_t SPISendQueue;
 
 TaskHandle_t spiTask;