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Fix crash due to: <https://issues.guix.gnu.org/issue/39266>.
diff --git a/libguile/struct.c b/libguile/struct.c
index 3dbcc71d4..ddcbe46d2 100644
--- a/libguile/struct.c
+++ b/libguile/struct.c
@@ -139,7 +139,9 @@ set_vtable_access_fields (SCM vtable)
nfields = len / 2;
bitmask_size = (nfields + 31U) / 32U;
- unboxed_fields = scm_gc_malloc_pointerless (bitmask_size, "unboxed fields");
+ unboxed_fields =
+ scm_gc_malloc_pointerless (bitmask_size * sizeof (*unboxed_fields),
+ "unboxed fields");
memset (unboxed_fields, 0, bitmask_size * sizeof(*unboxed_fields));
/* Update FLAGS according to LAYOUT. */
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