diff --git a/lib/libesp32/Berry/src/be_exec.c b/lib/libesp32/Berry/src/be_exec.c
index 2d71dab0f..8ed0bc8f1 100644
--- a/lib/libesp32/Berry/src/be_exec.c
+++ b/lib/libesp32/Berry/src/be_exec.c
@@ -390,6 +390,10 @@ void be_stack_expansion(bvm *vm, int n)
         stack_resize(vm, size + 1);
         be_raise(vm, "runtime_error", STACK_OVER_MSG(BE_STACK_TOTAL_MAX));
     }
+#if BE_USE_OBSERVABILITY_HOOK
+    if (vm->obshook != NULL)
+        (*vm->obshook)(vm, BE_OBS_STACK_RESIZE_START, size * sizeof(bvalue), (size + n) * sizeof(bvalue));
+#endif
     stack_resize(vm, size + n);
 }
 
diff --git a/lib/libesp32/Berry/src/berry.h b/lib/libesp32/Berry/src/berry.h
index fb67f28af..232a92262 100644
--- a/lib/libesp32/Berry/src/berry.h
+++ b/lib/libesp32/Berry/src/berry.h
@@ -405,6 +405,7 @@ enum beobshookevents {
   BE_OBS_GC_START,        /* start of GC, arg = allocated size */
   BE_OBS_GC_END,          /* end of GC, arg = allocated size */
   BE_OBS_VM_HEARTBEAT,    /* VM heartbeat called every million instructions */
+  BE_OBS_STACK_RESIZE_START,    /* Berry stack resized */
 };
 
 /* FFI functions */
diff --git a/tasmota/xdrv_52_9_berry.ino b/tasmota/xdrv_52_9_berry.ino
index b210ac446..113866c6f 100644
--- a/tasmota/xdrv_52_9_berry.ino
+++ b/tasmota/xdrv_52_9_berry.ino
@@ -268,6 +268,13 @@ void BerryObservability(bvm *vm, int event...) {
         }
       }
       break;
+    case BE_OBS_STACK_RESIZE_START:
+      {
+        int32_t stack_before = va_arg(param, int32_t);
+        int32_t stack_after = va_arg(param, int32_t);
+        AddLog(LOG_LEVEL_DEBUG, PSTR(D_LOG_BERRY "Stack resized from %i to %i bytes"), stack_before, stack_after);
+      }
+      break;
     case BE_OBS_VM_HEARTBEAT:
       {
         // AddLog(LOG_LEVEL_INFO, ">>>: Heartbeat now=%i timeout=%i", millis(), berry.timeout);