diff --git a/backend/codablock.c b/backend/codablock.c
index 88253df8..93ecc3c6 100644
--- a/backend/codablock.c
+++ b/backend/codablock.c
@@ -850,6 +850,8 @@ INTERNAL int codablockf(struct zint_symbol *symbol, unsigned char source[], int
     }
 #endif
 
+    symbol->rows = 0; /* Stacked are not stackable */
+
     /* Paint the C128 patterns */
     for (r = 0; r < rows; r++) {
         const int rc = r * columns;
diff --git a/backend/library.c b/backend/library.c
index bd0bbec2..02270ffd 100644
--- a/backend/library.c
+++ b/backend/library.c
@@ -1691,6 +1691,8 @@ unsigned int ZBarcode_Cap(int symbol_id, unsigned int cap_flag) {
         switch (symbol_id) {
             case BARCODE_CODE16K: /* Stacked are not stackable */
             case BARCODE_CODE49:
+            case BARCODE_CODABLOCKF:
+            case BARCODE_HIBC_BLOCKF:
                 break;
             default:
                 result |= ZINT_CAP_STACKABLE;