diff --git a/features/FEATURE_BLE/targets/TARGET_CORDIO/stack/mbed_os_adaptation/wsf_os.c b/features/FEATURE_BLE/targets/TARGET_CORDIO/stack/mbed_os_adaptation/wsf_os.c
index 5677c0cc0d..321d8b4912 100644
--- a/features/FEATURE_BLE/targets/TARGET_CORDIO/stack/mbed_os_adaptation/wsf_os.c
+++ b/features/FEATURE_BLE/targets/TARGET_CORDIO/stack/mbed_os_adaptation/wsf_os.c
@@ -49,7 +49,7 @@ WSF_CT_ASSERT(sizeof(uint32_t) == 4);
 
 /* maximum number of event handlers per task */
 #ifndef WSF_MAX_HANDLERS
-#define WSF_MAX_HANDLERS      9
+#define WSF_MAX_HANDLERS      10
 #endif
 
 #if WSF_OS_DIAG == TRUE