diff --git a/decompress.c b/decompress.c
index 311f566..391552d 100644
--- a/decompress.c
+++ b/decompress.c
@@ -288,6 +288,7 @@
       if (nGroups < 2 || nGroups > 6) RETURN(BZ_DATA_ERROR);
       GET_BITS(BZ_X_SELECTOR_2, nSelectors, 15);
       if (nSelectors < 1) RETURN(BZ_DATA_ERROR);
+      if (nSelectors > BZ_MAX_SELECTORS) RETURN(BZ_DATA_ERROR);
       for (i = 0; i < nSelectors; i++) {
          j = 0;
          while (True) {