diff --git a/firmware/controllers/math/engine_math.cpp b/firmware/controllers/math/engine_math.cpp
index 0dacafd20a..9bb4f4dc97 100644
--- a/firmware/controllers/math/engine_math.cpp
+++ b/firmware/controllers/math/engine_math.cpp
@@ -406,7 +406,7 @@ int getCylinderId(int index DECLARE_ENGINE_PARAMETER_SUFFIX) {
 
 	const int firingOrderLength = getFiringOrderLength(PASS_ENGINE_PARAMETER_SIGNATURE);
 
-	if (index < 1 || index > INJECTION_PIN_COUNT) {
+	if (firingOrderLength < 1 || firingOrderLength > INJECTION_PIN_COUNT) {
 		firmwareError(CUSTOM_ERR_6687, "fol %d", firingOrderLength);
 		return 1;
 	}