diff --git a/conf/modules/ahrs_chimu_uart.xml b/conf/modules/ahrs_chimu_uart.xml
index 78767fbfd3..f2e0531d79 100644
--- a/conf/modules/ahrs_chimu_uart.xml
+++ b/conf/modules/ahrs_chimu_uart.xml
@@ -18,7 +18,7 @@
     <define name="USE_INS_MODULE"/>
     <define name="USE_UART$(CHIMU_UART_NR)" value="1"/>
     <define name="INS_LINK" value="UART$(CHIMU_UART_NR)"/>
-    <define name="UART$(CHIMU_UART_NR)_BAUD" value="B115200"/>
+    <define name="uart$(CHIMU_UART_NR)_BAUD" value="B115200"/>
     <file name="ahrs_chimu_uart.c"/>
     <file name="imu_chimu.c"/>
     <file name="ahrs.c" dir="subsystems"/>