diff --git a/Libraries/PeriphDrivers/Source/UART/uart_reva.c b/Libraries/PeriphDrivers/Source/UART/uart_reva.c
index 2256afe35a1..759a1e7ebe0 100644
--- a/Libraries/PeriphDrivers/Source/UART/uart_reva.c
+++ b/Libraries/PeriphDrivers/Source/UART/uart_reva.c
@@ -50,7 +50,17 @@ typedef struct {
     bool auto_dma_handlers;
 } uart_reva_req_state_t;
 
-uart_reva_req_state_t states[MXC_UART_INSTANCES];
+// clang-format off
+uart_reva_req_state_t states[MXC_UART_INSTANCES] = {
+    [0 ... MXC_UART_INSTANCES - 1] = {
+        .tx_req = NULL,
+        .rx_req = NULL,
+        .channelTx = -1,
+        .channelRx = -1,
+        .auto_dma_handlers = false
+    }
+};
+// clang-format on
 
 /* **** Function Prototypes **** */
 
diff --git a/Libraries/PeriphDrivers/Source/UART/uart_revb.c b/Libraries/PeriphDrivers/Source/UART/uart_revb.c
index da82f678825..ecdbeddeefa 100644
--- a/Libraries/PeriphDrivers/Source/UART/uart_revb.c
+++ b/Libraries/PeriphDrivers/Source/UART/uart_revb.c
@@ -48,7 +48,17 @@ typedef struct {
     bool auto_dma_handlers;
 } uart_revb_req_state_t;
 
-uart_revb_req_state_t states[MXC_UART_INSTANCES];
+// clang-format off
+uart_revb_req_state_t states[MXC_UART_INSTANCES] = {
+    [0 ... MXC_UART_INSTANCES - 1] = {
+        .tx_req = NULL,
+        .rx_req = NULL,
+        .channelTx = -1,
+        .channelRx = -1,
+        .auto_dma_handlers = false
+    }
+};
+// clang-format on
 
 /* **** Function Prototypes **** */