diff --git a/tools/perf/util/disasm.c b/tools/perf/util/disasm.c
index 924429142631..88706b98b906 100644
--- a/tools/perf/util/disasm.c
+++ b/tools/perf/util/disasm.c
@@ -81,7 +81,7 @@ grow_from_non_allocated_table:
 	if (new_instructions == NULL)
 		return -1;
 
-	memcpy(new_instructions, arch->instructions, arch->nr_instructions);
+	memcpy(new_instructions, arch->instructions, arch->nr_instructions * sizeof(struct ins));
 	goto out_update_instructions;
 }