diff --git a/src/shrink_context.h b/src/shrink_context.h
index f56b14c..47ffce2 100644
--- a/src/shrink_context.h
+++ b/src/shrink_context.h
@@ -55,8 +55,8 @@ extern "C" {
 #define NARRIVALS_PER_POSITION_V2_MAX 64
 #define ARRIVALS_PER_POSITION_SHIFT 6
 
-#define NMATCHES_PER_INDEX_V1 8
-#define MATCHES_PER_INDEX_SHIFT_V1 3
+#define NMATCHES_PER_INDEX_V1 16
+#define MATCHES_PER_INDEX_SHIFT_V1 4
 
 #define NMATCHES_PER_INDEX_V2 64
 #define MATCHES_PER_INDEX_SHIFT_V2 6