diff --git a/src/rtos/FreeRTOS.c b/src/rtos/FreeRTOS.c
index 945c4b875..070275f2c 100644
--- a/src/rtos/FreeRTOS.c
+++ b/src/rtos/FreeRTOS.c
@@ -80,7 +80,7 @@ static int freertos_get_thread_reg_list(struct rtos *rtos, int64_t thread_id,
 		struct rtos_reg **reg_list, int *num_regs);
 static int freertos_get_symbol_list_to_lookup(struct symbol_table_elem *symbol_list[]);
 
-struct rtos_type freertos_rtos = {
+const struct rtos_type freertos_rtos = {
 	.name = "FreeRTOS",
 
 	.detect_rtos = freertos_detect_rtos,
diff --git a/src/rtos/chibios.c b/src/rtos/chibios.c
index 8319cc883..68fe8a14c 100644
--- a/src/rtos/chibios.c
+++ b/src/rtos/chibios.c
@@ -97,7 +97,7 @@ static int chibios_get_thread_reg_list(struct rtos *rtos, int64_t thread_id,
 		struct rtos_reg **reg_list, int *num_regs);
 static int chibios_get_symbol_list_to_lookup(struct symbol_table_elem *symbol_list[]);
 
-struct rtos_type chibios_rtos = {
+const struct rtos_type chibios_rtos = {
 	.name = "chibios",
 
 	.detect_rtos = chibios_detect_rtos,
diff --git a/src/rtos/embKernel.c b/src/rtos/embKernel.c
index c1b5723fc..a03b039e0 100644
--- a/src/rtos/embKernel.c
+++ b/src/rtos/embKernel.c
@@ -27,7 +27,7 @@ static int embkernel_get_thread_reg_list(struct rtos *rtos, int64_t thread_id,
 		struct rtos_reg **reg_list, int *num_regs);
 static int embkernel_get_symbol_list_to_lookup(struct symbol_table_elem *symbol_list[]);
 
-struct rtos_type embkernel_rtos = {
+const struct rtos_type embkernel_rtos = {
 		.name = "embKernel",
 		.detect_rtos = embkernel_detect_rtos,
 		.create = embkernel_create,
diff --git a/src/rtos/mqx.c b/src/rtos/mqx.c
index 8d483ed3b..d9b694282 100644
--- a/src/rtos/mqx.c
+++ b/src/rtos/mqx.c
@@ -498,7 +498,7 @@ static int mqx_get_symbol_list_to_lookup(struct symbol_table_elem *symbol_list[]
 	return ERROR_OK;
 }
 
-struct rtos_type mqx_rtos = {
+const struct rtos_type mqx_rtos = {
 	.name = "mqx",
 	.detect_rtos = mqx_detect_rtos,
 	.create = mqx_create,
diff --git a/src/rtos/nuttx.c b/src/rtos/nuttx.c
index 993ff84bd..78271181e 100644
--- a/src/rtos/nuttx.c
+++ b/src/rtos/nuttx.c
@@ -324,7 +324,7 @@ static int nuttx_get_symbol_list_to_lookup(struct symbol_table_elem *symbol_list
 	return 0;
 }
 
-struct rtos_type nuttx_rtos = {
+const struct rtos_type nuttx_rtos = {
 	.name = "nuttx",
 	.detect_rtos = nuttx_detect_rtos,
 	.create = nuttx_create,
diff --git a/src/rtos/rtos.c b/src/rtos/rtos.c
index bcd556a7b..f1e8956a3 100644
--- a/src/rtos/rtos.c
+++ b/src/rtos/rtos.c
@@ -16,22 +16,22 @@
 #include "server/gdb_server.h"
 
 /* RTOSs */
-extern struct rtos_type freertos_rtos;
-extern struct rtos_type threadx_rtos;
-extern struct rtos_type ecos_rtos;
-extern struct rtos_type linux_rtos;
-extern struct rtos_type chibios_rtos;
-extern struct rtos_type chromium_ec_rtos;
-extern struct rtos_type embkernel_rtos;
-extern struct rtos_type mqx_rtos;
-extern struct rtos_type ucos_iii_rtos;
-extern struct rtos_type nuttx_rtos;
-extern struct rtos_type hwthread_rtos;
-extern struct rtos_type riot_rtos;
-extern struct rtos_type zephyr_rtos;
-extern struct rtos_type rtkernel_rtos;
+extern const struct rtos_type freertos_rtos;
+extern const struct rtos_type threadx_rtos;
+extern const struct rtos_type ecos_rtos;
+extern const struct rtos_type linux_rtos;
+extern const struct rtos_type chibios_rtos;
+extern const struct rtos_type chromium_ec_rtos;
+extern const struct rtos_type embkernel_rtos;
+extern const struct rtos_type mqx_rtos;
+extern const struct rtos_type ucos_iii_rtos;
+extern const struct rtos_type nuttx_rtos;
+extern const struct rtos_type hwthread_rtos;
+extern const struct rtos_type riot_rtos;
+extern const struct rtos_type zephyr_rtos;
+extern const struct rtos_type rtkernel_rtos;
 
-static struct rtos_type *rtos_types[] = {
+static const struct rtos_type *rtos_types[] = {
 	&threadx_rtos,
 	&freertos_rtos,
 	&ecos_rtos,
@@ -70,7 +70,7 @@ static int rtos_target_for_threadid(struct connection *connection, int64_t threa
 	return ERROR_OK;
 }
 
-static int os_alloc(struct target *target, struct rtos_type *ostype)
+static int os_alloc(struct target *target, const struct rtos_type *ostype)
 {
 	struct rtos *os = target->rtos = calloc(1, sizeof(struct rtos));
 
@@ -100,7 +100,7 @@ static void os_free(struct target *target)
 	target->rtos = NULL;
 }
 
-static int os_alloc_create(struct target *target, struct rtos_type *ostype)
+static int os_alloc_create(struct target *target, const struct rtos_type *ostype)
 {
 	int ret = os_alloc(target, ostype);
 
@@ -683,7 +683,7 @@ int rtos_generic_stack_read(struct target *target,
 static int rtos_try_next(struct target *target)
 {
 	struct rtos *os = target->rtos;
-	struct rtos_type **type = rtos_types;
+	const struct rtos_type **type = rtos_types;
 
 	if (!os)
 		return 0;
diff --git a/src/rtos/zephyr.c b/src/rtos/zephyr.c
index b00b4b341..934a8dd1c 100644
--- a/src/rtos/zephyr.c
+++ b/src/rtos/zephyr.c
@@ -785,7 +785,7 @@ static int zephyr_get_symbol_list_to_lookup(struct symbol_table_elem **symbol_li
 	return ERROR_OK;
 }
 
-struct rtos_type zephyr_rtos = {
+const struct rtos_type zephyr_rtos = {
 	.name = "Zephyr",
 
 	.detect_rtos = zephyr_detect_rtos,