diff --git a/backend/dotcode.c b/backend/dotcode.c
index 00194b4a..1427f9c5 100644
--- a/backend/dotcode.c
+++ b/backend/dotcode.c
@@ -1083,7 +1083,7 @@ int dotcode(struct zint_symbol *symbol, unsigned char source[], int length) {
         }
     }
 
-    if ((height > 177) || (width > 177)) {
+    if ((height > 200) || (width > 200)) {
         strcpy(symbol->errtxt, "Specified symbol size is too large");
         return ZINT_ERROR_INVALID_OPTION;
     }
diff --git a/backend/zint.h b/backend/zint.h
index 82e6f3e3..7cb73081 100644
--- a/backend/zint.h
+++ b/backend/zint.h
@@ -87,8 +87,8 @@ extern "C" {
         int rows;
         int width;
         char primary[128];
-        unsigned char encoded_data[178][143];
-        int row_height[178]; /* Largest symbol is 177x177 QR Code */
+        unsigned char encoded_data[200][143];
+        int row_height[200]; /* Largest symbol is 189 x 189 Han Xin */
         char errtxt[100];
         char *bitmap;
         int bitmap_width;