diff --git a/examples/user/main.c b/examples/user/main.c
index 7feffc74..8c7083a3 100644
--- a/examples/user/main.c
+++ b/examples/user/main.c
@@ -100,7 +100,7 @@ static unsigned int blink = 0;
 
 // Analog in --------------------------
 
-static ec_pdo_entry_info_t el3102_pdo_entries[] = {
+static const ec_pdo_entry_info_t el3102_pdo_entries[] = {
     {0x3101, 1,  8}, // channel 1 status
     {0x3101, 2, 16}, // channel 1 value
     {0x3102, 1,  8}, // channel 2 status
@@ -109,12 +109,12 @@ static ec_pdo_entry_info_t el3102_pdo_entries[] = {
     {0x6401, 2, 16}  // channel 2 value (alt.)
 };
 
-static ec_pdo_info_t el3102_pdos[] = {
+static const ec_pdo_info_t el3102_pdos[] = {
     {0x1A00, 2, el3102_pdo_entries},
     {0x1A01, 2, el3102_pdo_entries + 2}
 };
 
-static ec_sync_info_t el3102_syncs[] = {
+static const ec_sync_info_t el3102_syncs[] = {
     {2, EC_DIR_OUTPUT},
     {3, EC_DIR_INPUT, 2, el3102_pdos},
     {0xff}
@@ -122,17 +122,17 @@ static ec_sync_info_t el3102_syncs[] = {
 
 // Analog out -------------------------
 
-static ec_pdo_entry_info_t el4102_pdo_entries[] = {
+static const ec_pdo_entry_info_t el4102_pdo_entries[] = {
     {0x3001, 1, 16}, // channel 1 value
     {0x3002, 1, 16}, // channel 2 value
 };
 
-static ec_pdo_info_t el4102_pdos[] = {
+static const ec_pdo_info_t el4102_pdos[] = {
     {0x1600, 1, el4102_pdo_entries},
     {0x1601, 1, el4102_pdo_entries + 1}
 };
 
-static ec_sync_info_t el4102_syncs[] = {
+static const ec_sync_info_t el4102_syncs[] = {
     {2, EC_DIR_OUTPUT, 2, el4102_pdos},
     {3, EC_DIR_INPUT},
     {0xff}
@@ -140,21 +140,21 @@ static ec_sync_info_t el4102_syncs[] = {
 
 // Digital out ------------------------
 
-static ec_pdo_entry_info_t el2004_channels[] = {
+static const ec_pdo_entry_info_t el2004_channels[] = {
     {0x3001, 1, 1}, // Value 1
     {0x3001, 2, 1}, // Value 2
     {0x3001, 3, 1}, // Value 3
     {0x3001, 4, 1}  // Value 4
 };
 
-static ec_pdo_info_t el2004_pdos[] = {
+static const ec_pdo_info_t el2004_pdos[] = {
     {0x1600, 1, &el2004_channels[0]},
     {0x1601, 1, &el2004_channels[1]},
     {0x1602, 1, &el2004_channels[2]},
     {0x1603, 1, &el2004_channels[3]}
 };
 
-static ec_sync_info_t el2004_syncs[] = {
+static const ec_sync_info_t el2004_syncs[] = {
     {0, EC_DIR_OUTPUT, 4, el2004_pdos},
     {1, EC_DIR_INPUT},
     {0xff}
diff --git a/examples/xenomai/main.c b/examples/xenomai/main.c
index e76dff20..ca3d8674 100644
--- a/examples/xenomai/main.c
+++ b/examples/xenomai/main.c
@@ -84,14 +84,14 @@ const static ec_pdo_entry_reg_t domain1_regs[] = {
  * Revision number: 0x00100000
  */
 
-ec_pdo_entry_info_t slave_1_pdo_entries[] = {
+const ec_pdo_entry_info_t slave_1_pdo_entries[] = {
    {0x7000, 0x01, 1}, /* Output */
    {0x7010, 0x01, 1}, /* Output */
    {0x7020, 0x01, 1}, /* Output */
    {0x7030, 0x01, 1}, /* Output */
 };
 
-ec_pdo_info_t slave_1_pdos[] = {
+const ec_pdo_info_t slave_1_pdos[] = {
    {0x1600, 1, slave_1_pdo_entries + 0}, /* Channel 1 */
    {0x1601, 1, slave_1_pdo_entries + 1}, /* Channel 2 */
    {0x1602, 1, slave_1_pdo_entries + 2}, /* Channel 3 */
diff --git a/examples/xenomai_posix/main.c b/examples/xenomai_posix/main.c
index 28f9254f..71593b75 100644
--- a/examples/xenomai_posix/main.c
+++ b/examples/xenomai_posix/main.c
@@ -86,21 +86,21 @@ const static ec_pdo_entry_reg_t domain1_regs[] = {
  * Revision number: 0x00100000
  */
 
-ec_pdo_entry_info_t slave_1_pdo_entries[] = {
+const ec_pdo_entry_info_t slave_1_pdo_entries[] = {
    {0x7000, 0x01, 1}, /* Output */
    {0x7010, 0x01, 1}, /* Output */
    {0x7020, 0x01, 1}, /* Output */
    {0x7030, 0x01, 1}, /* Output */
 };
 
-ec_pdo_info_t slave_1_pdos[] = {
+const ec_pdo_info_t slave_1_pdos[] = {
    {0x1600, 1, slave_1_pdo_entries + 0}, /* Channel 1 */
    {0x1601, 1, slave_1_pdo_entries + 1}, /* Channel 2 */
    {0x1602, 1, slave_1_pdo_entries + 2}, /* Channel 3 */
    {0x1603, 1, slave_1_pdo_entries + 3}, /* Channel 4 */
 };
 
-ec_sync_info_t slave_1_syncs[] = {
+const ec_sync_info_t slave_1_syncs[] = {
    {0, EC_DIR_OUTPUT, 4, slave_1_pdos + 0, EC_WD_ENABLE},
    {0xff}
 };
diff --git a/include/ecrt.h b/include/ecrt.h
index 554f74d1..ab3f8035 100644
--- a/include/ecrt.h
+++ b/include/ecrt.h
@@ -547,7 +547,7 @@ typedef struct {
                               Zero means, that the default mapping shall be
                               used (this can only be done if the slave is
                               present at bus configuration time). */
-    ec_pdo_entry_info_t *entries; /**< Array of PDO entries to map. Can either
+    ec_pdo_entry_info_t const *entries; /**< Array of PDO entries to map. Can either
                                     be \a NULL, or must contain at
                                     least \a n_entries values. */
 } ec_pdo_info_t;
@@ -566,7 +566,7 @@ typedef struct {
                      but can also be \a 0xff to mark the end of the list. */
     ec_direction_t dir; /**< Sync manager direction. */
     unsigned int n_pdos; /**< Number of PDOs in \a pdos. */
-    ec_pdo_info_t *pdos; /**< Array with PDOs to assign. This must contain
+    ec_pdo_info_t const *pdos; /**< Array with PDOs to assign. This must contain
                             at least \a n_pdos PDOs. */
     ec_watchdog_mode_t watchdog_mode; /**< Watchdog mode. */
 } ec_sync_info_t;