diff --git a/src/rtos/Makefile.am b/src/rtos/Makefile.am
index 0796910de..5267fea24 100644
--- a/src/rtos/Makefile.am
+++ b/src/rtos/Makefile.am
@@ -11,15 +11,15 @@ noinst_LTLIBRARIES += %D%/librtos.la
 	%D%/rtos_ucos_iii_stackings.c \
 	%D%/rtos_riot_stackings.c \
 	%D%/rtos_nuttx_stackings.c \
-	%D%/FreeRTOS.c \
-	%D%/ThreadX.c \
-	%D%/eCos.c \
+	%D%/freertos.c \
+	%D%/threadx.c \
+	%D%/ecos.c \
 	%D%/linux.c \
 	%D%/chibios.c \
 	%D%/chromium-ec.c \
-	%D%/embKernel.c \
+	%D%/embkernel.c \
 	%D%/mqx.c \
-	%D%/uCOS-III.c \
+	%D%/ucos_iii.c \
 	%D%/nuttx.c \
 	%D%/rtkernel.c \
 	%D%/hwthread.c \
diff --git a/src/rtos/eCos.c b/src/rtos/ecos.c
similarity index 100%
rename from src/rtos/eCos.c
rename to src/rtos/ecos.c
diff --git a/src/rtos/embKernel.c b/src/rtos/embkernel.c
similarity index 100%
rename from src/rtos/embKernel.c
rename to src/rtos/embkernel.c
diff --git a/src/rtos/FreeRTOS.c b/src/rtos/freertos.c
similarity index 100%
rename from src/rtos/FreeRTOS.c
rename to src/rtos/freertos.c
diff --git a/src/rtos/ThreadX.c b/src/rtos/threadx.c
similarity index 100%
rename from src/rtos/ThreadX.c
rename to src/rtos/threadx.c
diff --git a/src/rtos/uCOS-III.c b/src/rtos/ucos_iii.c
similarity index 100%
rename from src/rtos/uCOS-III.c
rename to src/rtos/ucos_iii.c