diff --git a/target/ppc/int_helper.c b/target/ppc/int_helper.c
index 03d37da..d52338e 100644
--- a/target/ppc/int_helper.c
+++ b/target/ppc/int_helper.c
@@ -1951,7 +1951,7 @@
 #define VINSERT(suffix, element)                                            \
     void helper_vinsert##suffix(ppc_avr_t *r, ppc_avr_t *b, uint32_t index) \
     {                                                                       \
-        memmove(&r->u8[index], &b->u8[8 - sizeof(r->element)],              \
+        memmove(&r->u8[index], &b->u8[8 - sizeof(r->element[0])],           \
                sizeof(r->element[0]));                                      \
     }
 #else