diff --git a/lark1fq/src/filter.h b/lark1fq/src/filter.h
index 1c91fa9..4246d7c 100755
--- a/lark1fq/src/filter.h
+++ b/lark1fq/src/filter.h
@@ -12,10 +12,10 @@
 #define FILTER_SUM_LEN_GAS3    (8 * 2)
 #define FILTER_SUM_LEN_GAS4    (8 * 2)
 
-#define FILTER_MEDIAN_LEN_GAS1 (128)
-#define FILTER_MEDIAN_LEN_GAS2 (64)
-#define FILTER_MEDIAN_LEN_GAS3 (64)
-#define FILTER_MEDIAN_LEN_GAS4 (64)
+#define FILTER_MEDIAN_LEN_GAS1 (1024)
+#define FILTER_MEDIAN_LEN_GAS2 (128)
+#define FILTER_MEDIAN_LEN_GAS3 (128)
+#define FILTER_MEDIAN_LEN_GAS4 (128)
 
 #define FILTER_WINDOW_LEN_GAS1 (256)
 #define FILTER_WINDOW_LEN_GAS2 (32)