diff --git a/java_tools/ConfigDefinition.jar b/java_tools/ConfigDefinition.jar
index b6a7ba28ec..a7cdd7054a 100644
Binary files a/java_tools/ConfigDefinition.jar and b/java_tools/ConfigDefinition.jar differ
diff --git a/java_tools/configuration_definition/src/main/java/com/rusefi/output/BaseCHeaderConsumer.java b/java_tools/configuration_definition/src/main/java/com/rusefi/output/BaseCHeaderConsumer.java
index 9f8802a701..6fa82bc57c 100644
--- a/java_tools/configuration_definition/src/main/java/com/rusefi/output/BaseCHeaderConsumer.java
+++ b/java_tools/configuration_definition/src/main/java/com/rusefi/output/BaseCHeaderConsumer.java
@@ -80,7 +80,10 @@ public class BaseCHeaderConsumer implements ConfigurationConsumer {
         }
 
         content.append("};" + EOL);
-        content.append("static_assert(sizeof(" + structure.getName() + ") == " + iterator.currentOffset + ");\n");
+        int realSize = iterator.currentOffset;
+        // https://stackoverflow.com/questions/621616/c-what-is-the-size-of-an-object-of-an-empty-class
+        int cppSize = Math.max(1, realSize);
+        content.append("static_assert(sizeof(" + structure.getName() + ") == " + cppSize + ");\n");
         content.append(EOL);
     }
 
diff --git a/java_tools/configuration_definition/src/test/java/com/rusefi/test/TSProjectConsumerTest.java b/java_tools/configuration_definition/src/test/java/com/rusefi/test/TSProjectConsumerTest.java
index 1476615d6e..34c52986b1 100644
--- a/java_tools/configuration_definition/src/test/java/com/rusefi/test/TSProjectConsumerTest.java
+++ b/java_tools/configuration_definition/src/test/java/com/rusefi/test/TSProjectConsumerTest.java
@@ -118,7 +118,7 @@ public class TSProjectConsumerTest {
         assertEquals("// start of pid_s\n" +
                 "struct pid_s {\n" +
                 "};\n" +
-                "static_assert(sizeof(pid_s) == 0);\n" +
+                "static_assert(sizeof(pid_s) == 1);\n" +
                 "\n", consumer.getContent());
     }
 }