diff --git a/source/blender/imbuf/intern/format_iris.cc b/source/blender/imbuf/intern/format_iris.cc
index 3cd63afe647..f55d474f916 100644
--- a/source/blender/imbuf/intern/format_iris.cc
+++ b/source/blender/imbuf/intern/format_iris.cc
@@ -293,7 +293,7 @@ ImBuf *imb_loadiris(const uchar *mem, size_t size, int flags, ImFileColorSpace &
   } \
   ((void)0)
 
-    MFILE_CAPACITY_AT_PTR_OK_OR_FAIL(MFILE_DATA(inf) + ((4 * 2) * tablen));
+    MFILE_CAPACITY_AT_PTR_OK_OR_FAIL(MFILE_DATA(inf) + (2 * tablen));
 
     readtab(inf, starttab, tablen);
     readtab(inf, lengthtab, tablen);