diff --git a/src/platform/Darwin/PosixConfig.cpp b/src/platform/Darwin/PosixConfig.cpp
index e15bab933eb6b6..4959b2ff293c5e 100644
--- a/src/platform/Darwin/PosixConfig.cpp
+++ b/src/platform/Darwin/PosixConfig.cpp
@@ -70,6 +70,8 @@ const PosixConfig::Key PosixConfig::kConfigKey_Breadcrumb         = { kConfigNam
 // Prefix used for NVS keys that contain Chip group encryption keys.
 const char PosixConfig::kGroupKeyNamePrefix[] = "gk-";
 
+uint16_t PosixConfig::mPosixSetupDiscriminator = 0xF00; // CHIP_DEVICE_CONFIG_USE_TEST_SETUP_DISCRIMINATOR
+
 CHIP_ERROR PosixConfig::Init()
 {
     CHIP_ERROR err = CHIP_NO_ERROR;
@@ -88,9 +90,12 @@ CHIP_ERROR PosixConfig::ReadConfigValue(Key key, bool & val)
 CHIP_ERROR PosixConfig::ReadConfigValue(Key key, uint32_t & val)
 {
     CHIP_ERROR err = CHIP_DEVICE_ERROR_CONFIG_NOT_FOUND;
-    SuccessOrExit(err);
 
-exit:
+    if (key == kConfigKey_SetupDiscriminator)
+    {
+        val = mPosixSetupDiscriminator;
+        return CHIP_NO_ERROR;
+    }
     return err;
 }
 
@@ -133,9 +138,12 @@ CHIP_ERROR PosixConfig::WriteConfigValue(Key key, bool val)
 CHIP_ERROR PosixConfig::WriteConfigValue(Key key, uint32_t val)
 {
     CHIP_ERROR err = CHIP_DEVICE_ERROR_CONFIG_NOT_FOUND;
-    SuccessOrExit(err);
 
-exit:
+    if (key == kConfigKey_SetupDiscriminator)
+    {
+        mPosixSetupDiscriminator = val;
+        return CHIP_NO_ERROR;
+    }
     return err;
 }
 
diff --git a/src/platform/Darwin/PosixConfig.h b/src/platform/Darwin/PosixConfig.h
index 2964199bce4f49..1dcd7158c39431 100644
--- a/src/platform/Darwin/PosixConfig.h
+++ b/src/platform/Darwin/PosixConfig.h
@@ -100,6 +100,10 @@ class PosixConfig
     // NVS Namespace helper functions.
     static CHIP_ERROR EnsureNamespace(const char * ns);
     static CHIP_ERROR ClearNamespace(const char * ns);
+
+private:
+    // TODO: This is temporary until Darwin implements a proper ReadConfigValue
+    static uint16_t mPosixSetupDiscriminator;
 };
 
 struct PosixConfig::Key