diff --git a/firmware/integration/rusefi_config.txt b/firmware/integration/rusefi_config.txt
index 119260e7a8..903bf08138 100644
--- a/firmware/integration/rusefi_config.txt
+++ b/firmware/integration/rusefi_config.txt
@@ -1937,3 +1937,4 @@ end_struct
 #define show_Frankenso_presets true
 #define show_microRusEFI_presets true
 #define show_Proteus_presets true
+
diff --git a/java_tools/configuration_definition/src/com/rusefi/test/VariableRegistryTest.java b/java_tools/configuration_definition/src/com/rusefi/test/VariableRegistryTest.java
index d0c0bc99b1..b58e134adc 100644
--- a/java_tools/configuration_definition/src/com/rusefi/test/VariableRegistryTest.java
+++ b/java_tools/configuration_definition/src/com/rusefi/test/VariableRegistryTest.java
@@ -37,4 +37,22 @@ public class VariableRegistryTest {
         assertEquals("ab'r'", registry.applyVariables("ab@@SD_r@@"));
         assertEquals("abr", registry.applyVariables("ab@@SD_r" + CHAR_SUFFIX + "@@"));
     }
+
+    @Test
+    public void testPrepend() {
+        VariableRegistry registry = new VariableRegistry();
+        registry.register("key_string", "value_1");
+        assertEquals("value_1", registry.get("key_string"));
+
+        registry.register("key_string", "value_2");
+        assertEquals("value_1", registry.get("key_string"));
+
+        registry.register("key_int", 1);
+        assertEquals("1", registry.get("key_int"));
+        assertEquals("1", registry.get("key_int" + _HEX_SUFFIX));
+
+        registry.register("key_int", 2);
+        assertEquals("1", registry.get("key_int"));
+        assertEquals("1", registry.get("key_int" + _HEX_SUFFIX));
+    }
 }