diff --git a/mm/maccess.c b/mm/maccess.c
index d3f1a1f0b1c1..ded4bfaba7f3 100644
--- a/mm/maccess.c
+++ b/mm/maccess.c
@@ -99,7 +99,7 @@ long strncpy_from_kernel_nofault(char *dst, const void *unsafe_addr, long count)
 	return src - unsafe_addr;
 Efault:
 	pagefault_enable();
-	dst[-1] = '\0';
+	dst[0] = '\0';
 	return -EFAULT;
 }
 #else /* HAVE_GET_KERNEL_NOFAULT */