diff --git a/core/iwasm/common/wasm_runtime_common.c b/core/iwasm/common/wasm_runtime_common.c
index 685c7de04..51ecf23f9 100644
--- a/core/iwasm/common/wasm_runtime_common.c
+++ b/core/iwasm/common/wasm_runtime_common.c
@@ -1725,12 +1725,12 @@ wasi_nn_graph_registry_set_args(struct wasi_nn_graph_registry *registry,
     return true;
 }
 
-int
+static int
 wasi_nn_graph_registry_create(struct wasi_nn_graph_registry **registryp)
 {
     struct wasi_nn_graph_registry *args = wasm_runtime_malloc(sizeof(*args));
     if (args == NULL) {
-        return false;
+        return -1;
     }
     wasm_runtime_wasi_nn_graph_registry_args_set_defaults(args);
     *registryp = args;
diff --git a/core/iwasm/libraries/wasi-nn/src/wasi_nn.c b/core/iwasm/libraries/wasi-nn/src/wasi_nn.c
index 8bb7e57cd..892ca5dd7 100644
--- a/core/iwasm/libraries/wasi-nn/src/wasi_nn.c
+++ b/core/iwasm/libraries/wasi-nn/src/wasi_nn.c
@@ -35,7 +35,7 @@
 #define LLAMACPP_BACKEND_LIB "libwasi_nn_llamacpp" LIB_EXTENTION
 #define ONNX_BACKEND_LIB "libwasi_nn_onnx" LIB_EXTENTION
 
-#define MAX_GLOBAL_GRAPHS_PER_INST 4 // ONNX only allows 4 graphs per instance
+#define MAX_GLOBAL_GRAPHS_PER_INST 4
 
 /* Global variables */
 static korp_mutex wasi_nn_lock;
diff --git a/core/iwasm/libraries/wasi-nn/test/requirements.txt b/core/iwasm/libraries/wasi-nn/test/requirements.txt
index 0c80fd6b1..2145e3736 100644
--- a/core/iwasm/libraries/wasi-nn/test/requirements.txt
+++ b/core/iwasm/libraries/wasi-nn/test/requirements.txt
@@ -1,2 +1,2 @@
-tensorflow==2.14.0
+tensorflow==2.12.0
 numpy==1.24.4