diff --git a/src/lib/openjp2/ht_dec.c b/src/lib/openjp2/ht_dec.c
index e2f3afd6..777ea42a 100644
--- a/src/lib/openjp2/ht_dec.c
+++ b/src/lib/openjp2/ht_dec.c
@@ -1063,7 +1063,7 @@ static OPJ_BOOL opj_t1_allocate_buffers(
         if (flagssize > t1->flagssize) {
 
             opj_aligned_free(t1->flags);
-            t1->flags = (opj_flag_t*) opj_aligned_malloc(flagssize);
+            t1->flags = (opj_flag_t*) opj_aligned_malloc(flagssize * sizeof(opj_flag_t));
             if (!t1->flags) {
                 /* FIXME event manager error callback */
                 return OPJ_FALSE;