diff --git a/core/iwasm/aot/aot_runtime.c b/core/iwasm/aot/aot_runtime.c
index 94c66e67..2c647d34 100644
--- a/core/iwasm/aot/aot_runtime.c
+++ b/core/iwasm/aot/aot_runtime.c
@@ -420,7 +420,7 @@ memory_instantiate(AOTModuleInstance *module_inst, AOTModuleInstance *parent,
         if (num_bytes_per_page < heap_size) {
             set_error_buf(error_buf, error_buf_size,
                           "failed to insert app heap into linear memory, "
-                          "try using `--heap_size=0` option");
+                          "try using `--heap-size=0` option");
             return NULL;
         }
     }
@@ -478,7 +478,7 @@ memory_instantiate(AOTModuleInstance *module_inst, AOTModuleInstance *parent,
         if (init_page_count > DEFAULT_MAX_PAGES) {
             set_error_buf(error_buf, error_buf_size,
                           "failed to insert app heap into linear memory, "
-                          "try using `--heap_size=0` option");
+                          "try using `--heap-size=0` option");
             return NULL;
         }
         else if (init_page_count == DEFAULT_MAX_PAGES) {
diff --git a/core/iwasm/interpreter/wasm_runtime.c b/core/iwasm/interpreter/wasm_runtime.c
index b94be328..63df4cb3 100644
--- a/core/iwasm/interpreter/wasm_runtime.c
+++ b/core/iwasm/interpreter/wasm_runtime.c
@@ -202,7 +202,7 @@ memory_instantiate(WASMModuleInstance *module_inst, WASMModuleInstance *parent,
         if (num_bytes_per_page < heap_size) {
             set_error_buf(error_buf, error_buf_size,
                           "failed to insert app heap into linear memory, "
-                          "try using `--heap_size=0` option");
+                          "try using `--heap-size=0` option");
             return NULL;
         }
     }
@@ -261,7 +261,7 @@ memory_instantiate(WASMModuleInstance *module_inst, WASMModuleInstance *parent,
         if (init_page_count > DEFAULT_MAX_PAGES) {
             set_error_buf(error_buf, error_buf_size,
                           "failed to insert app heap into linear memory, "
-                          "try using `--heap_size=0` option");
+                          "try using `--heap-size=0` option");
             return NULL;
         }
         else if (init_page_count == DEFAULT_MAX_PAGES) {