diff --git a/arch/s390/kernel/perf_pai_crypto.c b/arch/s390/kernel/perf_pai_crypto.c
index 62bf8a15bf32..9b06b8a83342 100644
--- a/arch/s390/kernel/perf_pai_crypto.c
+++ b/arch/s390/kernel/perf_pai_crypto.c
@@ -428,7 +428,7 @@ static size_t paicrypt_copy(struct pai_userdata *userdata, unsigned long *page,
 			outidx++;
 		}
 	}
-	return outidx * sizeof(struct pai_userdata);
+	return outidx * sizeof(*userdata);
 }
 
 static int paicrypt_push_sample(size_t rawsize, struct paicrypt_map *cpump,