diff --git a/firmware/controllers/algo/accel_enrichment.cpp b/firmware/controllers/algo/accel_enrichment.cpp
index 1e56c116fe..bc3a395d65 100644
--- a/firmware/controllers/algo/accel_enrichment.cpp
+++ b/firmware/controllers/algo/accel_enrichment.cpp
@@ -147,11 +147,19 @@ static void setDecelMult(float value) {
 }
 
 static void setTpsAccelLen(int len) {
+	if (len < 1) {
+		scheduleMsg(logger, "Length shoold be positive");
+		return;
+	}
 	engine->tpsAccelEnrichment.cb.setSize(len);
 	accelInfo();
 }
 
 static void setMapAccelLen(int len) {
+	if (len < 1) {
+		scheduleMsg(logger, "Length shoold be positive");
+		return;
+	}
 	engine->mapAccelEnrichment.cb.setSize(len);
 	accelInfo();
 }
diff --git a/firmware/integration/rusefi_config.txt b/firmware/integration/rusefi_config.txt
index 9a82095277..b644e3f6aa 100644
--- a/firmware/integration/rusefi_config.txt
+++ b/firmware/integration/rusefi_config.txt
@@ -485,11 +485,11 @@ custom pin_input_mode_e 4 scalar, F32,	@OFFSET@,	"ms", 1, 0, 0, 200, 1
 	float alternatorControlDFactor;
 	int[137] unused3;
 
-	int tpsAccelLength;;"len",        1,     0,    0, 200,     3
+	int tpsAccelLength;;"len",        1,     0,    1, 200,     3
 	float tpsAccelEnrichmentThreshold;;"roc",        1,     0,    0, 200,     3
 	float tpsAccelEnrichmentMultiplier;;"coeff",        1,     0,    0, 200,     3
 	
-	int mapAccelLength;;"len",        1,     0,    0, 200,     3
+	int mapAccelLength;;"len",        1,     0,    1, 200,     3
 	
 	float decelEnrichmentThreshold;;"roc",        1,     0,    0, 200,     3
 	float decelEnrichmentMultiplier;;"coeff",        1,     0,    0, 200,     3
diff --git a/firmware/rusefi.cpp b/firmware/rusefi.cpp
index 7410905b97..91830de3e3 100644
--- a/firmware/rusefi.cpp
+++ b/firmware/rusefi.cpp
@@ -290,5 +290,5 @@ int getRusEfiVersion(void) {
 		return 123; // this is here to make the compiler happy about the unused array
 	if (UNUSED_CCM_SIZE[0] * 0 != 0)
 		return 3211; // this is here to make the compiler happy about the unused array
-	return 20150412;
+	return 20150413;
 }
diff --git a/firmware/tunerstudio/rusefi.ini b/firmware/tunerstudio/rusefi.ini
index b9223fb7ff..77de51f7d7 100644
--- a/firmware/tunerstudio/rusefi.ini
+++ b/firmware/tunerstudio/rusefi.ini
@@ -451,10 +451,10 @@ page = 1
 ;skipping alternatorControlIFactor offset 1628
 ;skipping alternatorControlDFactor offset 1632
 ;skipping unused3 offset 1636
-	tpsAccelLength					= scalar, S32,	2184,	"len", 1, 0, 0, 200, 3
+	tpsAccelLength					= scalar, S32,	2184,	"len", 1, 0, 1, 200, 3
 	tpsAccelEnrichmentThreshold		= scalar, F32,	2188,	"roc", 1, 0, 0, 200, 3
 	tpsAccelEnrichmentMultiplier		= scalar, F32,	2192,	"coeff", 1, 0, 0, 200, 3
-	mapAccelLength					= scalar, S32,	2196,	"len", 1, 0, 0, 200, 3
+	mapAccelLength					= scalar, S32,	2196,	"len", 1, 0, 1, 200, 3
 	decelEnrichmentThreshold		= scalar, F32,	2200,	"roc", 1, 0, 0, 200, 3
 	decelEnrichmentMultiplier		= scalar, F32,	2204,	"coeff", 1, 0, 0, 200, 3
 	mapAccelEnrichmentThreshold		= scalar, F32,	2208,	"roc", 1, 0, 0, 200, 3