diff --git a/nx/include/switch/services/ectx.h b/nx/include/switch/services/ectx.h
index f402f95a..ba5e697b 100644
--- a/nx/include/switch/services/ectx.h
+++ b/nx/include/switch/services/ectx.h
@@ -9,7 +9,7 @@
 #include "../kernel/event.h"
 #include "../sf/service.h"
 
-/// Initialize ectx:r.
+/// [11.0.0+] Initialize ectx:r.
 Result ectxrInitialize(void);
 
 /// Exit ectx:r.
@@ -19,7 +19,7 @@ void ectxrExit(void);
 Service* ectxrGetServiceSession(void);
 
 /**
- * @brief Retrieves the error context associated with an error descriptor and result.
+ * @brief [11.0.0+] Retrieves the error context associated with an error descriptor and result.
  * @return Result code.
  */
 Result ectxrPullContext(s32 *out0, u32 *out_total_size, u32 *out_size, void *dst, size_t dst_size, u32 descriptor, Result result);
diff --git a/nx/source/services/ectx.c b/nx/source/services/ectx.c
index 66b2ebd1..4f148b57 100644
--- a/nx/source/services/ectx.c
+++ b/nx/source/services/ectx.c
@@ -1,5 +1,6 @@
 #define NX_SERVICE_ASSUME_NON_DOMAIN
 #include "service_guard.h"
+#include "runtime/hosversion.h"
 #include "services/ectx.h"
 
 static Service g_ectxrSrv;
@@ -7,6 +8,8 @@ static Service g_ectxrSrv;
 NX_GENERATE_SERVICE_GUARD(ectxr);
 
 Result _ectxrInitialize(void) {
+    if (hosversionBefore(11,0,0))
+        return MAKERESULT(Module_Libnx, LibnxError_IncompatSysVer);
     return smGetService(&g_ectxrSrv, "ectx:r");
 }